constitution · epochs · watch · epoch 3

comparison

c_c6f5afec1d36 (tommy-mor) vs c_0c466eea1ed4 (tommy-mor)

download prompt · raw event · cmp_619ecb39b6afda

council reasoning

~anthropic/claude-sonnet-latest · winner A · 6:4 · permalink

Side A implements a concrete, integrated end-user feature (pool-scoped voting) with real logic changes in routing, next-pair selection, and UI, threading state correctly through the vote flow. Side B adds a useful but peripheral dev-only tool (sorterc) that duplicates existing server validation logic in a separate binary, providing convenience but no core product functionality or bugfix.

~x-ai/grok-latest · winner A · 3:2 · permalink

A adds end-to-end pool-scoped pairwise voting (optional pool query, first-unvoted pair selection, constrained next-pair nav, UI entry point, and form/JS threading), which deepens the core ranking product loop. B is solid reusable offline compile/scan tooling with tests and docs, but it is workspace dev infrastructure rather than a lasting user-facing capability, so it ranks slightly behind.

openai/gpt-chat-latest · winner A · 3:2 · permalink

Side A implements a cohesive product feature by extending the vote flow to support pool-scoped comparisons: it adds a new `pool` query parameter, generates initial pairs from a parent's children, preserves pool context through vote submission and next-pair navigation, and exposes the feature with a new "vote on children" UI link. Side B adds valuable developer tooling (`sorterc`) for offline DSL compilation and JSONL validation, but it is workspace-only infrastructure rather than functionality that directly expands the application's behavior.

sides

A — c_c6f5afec1d36 (tommy-mor)

message

[5350388a] Add pool-scoped voting: /vote?pool=<parent> picks pairs from children.

- /vote now accepts an optional `pool` param (parent item path). When
  provided without left/right, it picks the first unvoted pair from the
  pool's children. When provided alongside left/right, it constrains
  "next pair" navigation to siblings within the pool.
- "vote on children" button appears on item pages with ≥2 children,
  linking to /vote?pool=<item>.
- Pool is threaded through VoteComparePost → success JS so in-page
  morph after voting keeps the pool context for next-pair navigation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

diff preview

diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 5faa642451d69555cb391974beb0ad22c9355c8c..b79efdb4d52bd445a67f38cbfd61d3507d2b3014 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -193,6 +193,7 @@ async fn dispatch_ui_action(
             ratio_right,
             explanation,
             next,
+            pool,
             form_action,
         } => {
             if form_action != "/ui" {
@@ -239,6 +240,9 @@ async fn dispatch_ui_action(
                         .into_response();
                 }
             };
+            let pool_id = pool.as_deref().and_then(|p| {
+                crate::path_types::ItemId::parse(p.trim()).map(|i| i.normalized_storage())
+            });
             let mut rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);
             let mut rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);
             if rl == 0 && rr == 0 {
@@ -294,6 +298,7 @@ async fn dispatch_ui_action(
                         &thread_tag,
                         &left_id,
                         &right_id,
+                        pool_id.as_ref(),
                         pid.as_str(),
                         post_index,
                     )
diff --git a/server/src/html/garden/pin.rs b/server/src/html/garden/pin.rs
index 5865cfdbc06aeb6555c97380e25591fae6b3d125..1820d7fe7ee167ecbf5ad5124f23b2ab92ffb01f 100644
--- a/server/src/html/garden/pin.rs
+++ b/server/src/html/garden/pin.rs
@@ -79,7 +79,7 @@ pub(super) fn ont_pin_vote_controls(
                         }
                     }
                 } @else {
-                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None)) title="Compare and vote" {
+                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None, None)) title="Compare and vote" {
                         span class="ont-vote-glyph" aria-hidden="true" { "⚖" }
                         span { "vote" }
                     }
@@ -121,7 +121,7 @@ pub(super) fn child_row_pin_or_vote(
                         if nv == 1 { "" } else { "s" },
                     );
                     @let aria = format!("Vote; {} pairwise {}", nv, if nv == 1 { "vote" } else { "votes" });
-                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None)) title=(tip) aria-label=(aria) {
+                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None, None)) title=(tip) aria-label=(aria) {
                         span class="ont-garden-vote-glyph" aria-hidden="true" { "⚖" }
                         span class="ont-garden-vote-count" { (format!("{}", nv)) }
                     }
diff --git a/server/src/html/garden/render.rs b/server/src/html/garden/render.rs
index 5c3986ca36902f6c9019a4b5590f0b3b9d2cb4ff..bd8cbce059ee789de6e8dc9b6f69f54beee2f994 100644
--- a/server/src/html/garden/render.rs
+++ b/server/src/html/garden/render.rs
@@ -29,6 +29,7 @@ use super::{
     item::{child_depth_from_uri, item_code_label, item_display_path, item_href},
     item_page::{build_item_page_view_model, sibling_nav_markup},
     pin::{child_row_pin_or_vote, ont_pin_vote_controls, pinned_item_from_jar},
+    vote::vote_pool_href,
 };
 
 pub(super) async fn render_scope_view(
@@ -186,12 +187,21 @@ pub(super) async fn render_scope_view(
             }
 
             section class="ont-tab-panel ont-tab-panel-children" {
+                @let total_children = model.child_rankings.component_rankings
+                    .iter().map(|c| c.ranked.len()).sum::<usize>()
+                    + model.child_rankings.unranked_items.len();
                 h3 {
                     "ranked child groups"
                     @if model.child_depth > 1 {
                         " "
                         span class="muted" { (format!("(depth {})", model.child_depth)) }
                     }
+                    @if total_children >= 2 {
+                        " "
+                        a class="ont-vote-children-btn" href=(vote_pool_href(&nav, &model.item)) {
+                            "vote on children"
+                        }
+                    }
                 }
                 @if model.child_rankings.component_rankings.is_empty() {
                     p class="muted" { "no voted pairs yet in this scope" }
diff --git a/server/src/html/garden/tests.rs b/server/src/html/garden/tests.rs
index 6900a6795bcde866a176722149d6378e5127b4c3..c2036fca7752aef63d260e36cfe9649f63b5c550 100644
--- a/server/src/html/garden/tests.rs
+++ b/server/src/html/garden/tests.rs
@@ -105,7 +105,7 @@ fn suggest_next_vote_pair_prefers_unvoted_sibling_pair() {
     let content = content_for_garden_view(&reduced, &ScopeId::Public);
     let a = ItemId::parse("~/topic/a").unwrap().normalized_storage();
     let b = ItemId::parse("~/topic/b").unwrap().normalized_storage();
-    let next = suggest_next_vote_pair(content, &a, &b).expect("next sibling pair");
+    let next = suggest_next_vote_pair(content, &a, &b, None).expect("next sibling pair");
     assert_ne!(
         canonical_edge_items(&next.0, &next.1),
         canonical_edge_items(&a, &b)
diff --git a/server/src/html/garden/vote.rs b/server/src/html/garden/vote.rs
index 1d7fc8aa7436bfa9c1186dfd940a8d751ab7e088..2682cfcbd2f834b56459a02831aa225cffe67c58 100644
--- a/server/src/html/garden/vote.rs
+++ b/server/src/html/garden/vote.rs
@@ -211,14 +211,15 @@ pub(crate) async fn vote_compare_post_success_js(
     _thread_tag: &str,
     left: &ItemId,
     right: &ItemId,
+    pool: Option<&ItemId>,
     _post_id: &str,
     _post_idx: Option<usize>,
 ) -> String {
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
     let edge_history = vote_edge_history_markup(content, left, right);
-    let next_pair = suggest_next_vote_pair(content, left, right);
-    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref());
+    let next_pair = suggest_next_vote_pair(content, left, right, pool);
+    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref(), pool);
     drop(reduced);
     JsBuilder::new()
         .morph_inner_selector("#vote-edge-history-region", edge_history)
@@ -231,27 +232,39 @@ pub(super) fn vote_compare_href(
     left: &ItemId,
     right: &ItemId,
     thread_override: Option<&str>,
+    pool: Option<&ItemId>,
 ) -> String {
     let left_q = urlencoding::encode(left.as_str());
     let right_q = urlencoding::encode(right.as_str());
-    let base = format!(
+    let mut base = format!(
         "{}/vote?left={}&right={}",
         nav.room_path_prefix_for_vote_compare(),
         left_q,
         right_q
     );
     if let Some(t) = thread_override.filter(|s| !s.is_empty()) {
-        format!("{}&thread={}", base, urlencoding::encode(t))
-    } else {
-        base
+        base = format!("{}&thread={}", base, urlencoding::encode(t));
+    }
+    if let Some(p) = pool {
+        base = format!("{}&pool={}", base, urlencoding::encode(p.as_str()));
     }
+    base
+}
+
+pub(super) fn vote_pool_href(nav: &ThreadNav, pool_item_str: &str) -> String {
+    format!(
+        "{}/vote?pool={}",
+        nav.room_path_prefix_for_vote_compare(),
+        urlencoding::encode(pool_item_str)
+    )
 }
 
 fn vote_compare_nav_markup(
     nav: &ThreadNav,
     next_pair: Option<&(ItemId, ItemId)>,
+    pool: Option<&ItemId>,
 ) -> maud::Markup {
-    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None));
+    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None, pool));
     html! {
         div class="vote-compare-nav" {
             @if let Some(href) = &next_pair_href {
@@ -267,8 +280,15 @@ pub(super) fn suggest_next_vote_pair(
     content: &ContentState,
     current_left: &ItemId,
     current_right: &ItemId,
+    pool_parent: Option<&ItemId>,
 ) -> Option<(ItemId, ItemId)> {
-    let pool: Vec<ItemId> = if current_left.parent().as_ref().map(|p| p.as_str())
+    let pool: Vec<ItemId> = if let Some(parent) = pool_parent {
+        content
+            .item_children
+            .get(parent)
+            .map(|s| s.iter().cloned().collect())
+            .unwrap_or_default()
+    } else if current_left.parent().as_ref().map(|p| p.as_str())
         == current_right.parent().as_ref().map(|p| p.as_str())
     {
         current_left
@@ -322,10 +342,14 @@ pub(super) fn vote_compare_item_card(
 }
 #[derive(Debug, Deserialize)]
 pub struct VoteCompareQuery {
-    pub left: String,
-    pub right: String,
+    #[serde(default)]
+    pub left: Option<String>,
+    #[serde(default)]
+    pub right: Option<String>,
     #[serde(default)]
     pub thread: Option<String>,
+    #[serde(default)]
+    pub pool: Option<String>,
 }
 
 /// Public pairwise vote UI — `/vote?left=&right=&thread=`.
@@ -376,17 +400,53 @@ async fn vote_compare_inner(
     jar: CookieJar,
     uri: Uri,
 ) -> axum::response::Response {
-    let left = match ItemId::parse(q.left.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+    let pool_id: Option<ItemId> = match q.pool.as_deref() {
+        Some(p) => match ItemId::parse(p.trim()) {
+            Some(i) => Some(i.normalized_storage()),
+            None => return (StatusCode::BAD_REQUEST, "bad pool item").into_response(),
+        },
+        None => None,
     };
-    let right = match ItemId::parse(q.right.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+
+    let (left, right) = match (q.left.as_deref(), q.right.as_deref()) {
+        (Some(l), Some(r)) => {
+            let left = match ItemId::parse(l.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+            };
+            let right = match ItemId::parse(r.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+            };
+            if left == right {
+                return (StatusCode::BAD_REQUEST, "items must differ").into_response();
+            }
+            (left, right)
+        }
+        (None, None) => {
+            let Some(pool) = pool_id.as_ref() else {
+                return (StatusCode::BAD_REQUEST, "provide left+right or pool").into_response();
+            };
+            let reduced = state.reduced.read().await;
+            let content = content_for_garden_view(&reduced, &nav.scope());
+            let children: Vec<ItemId> = content
+                .item_children
+                .get(pool)
+                .map(|s| s.iter().cloned().collect())
+                .unwrap_or_default();
+            if children.len() < 2 {
+                drop(reduced);
+                return (StatusCode::BAD_REQUEST, "pool has fewer than 2 children to compare").into_response();
+            }
+            let pair = suggest_next_pair_in_pool(&content.ranking_group, &children, None);
+            drop(reduced);
+            match pair {
+                Some(p) => p,
+                None => return (StatusCode::BAD_REQUEST, "no pairs available in pool").into_response(),
+            }
+        }
+        _ => return (StatusCode::BAD_REQUEST, "provide both left and right, or just pool").into_response(),
     };
-    if left == right {
-        return (StatusCode::BAD_REQUEST, "items must differ").into_response();
-    }
 
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
@@ -409,7 +469,7 @@ async fn vote_compare_inner(
     let left_body = content.item_bodies.get(&left).cloned();
     let right_body = content.item_bodies.get(&right).cloned();
     let item_bodies_for_cards = content.item_bodies.

… preview truncated; 1,501 characters omitted

download full diff A

B — c_0c466eea1ed4 (tommy-mor)

message

[9e20d06c] Add sorterc dev tool for offline DSL compile and JSONL lint.

Introduce a workspace-only binary that validates .sorter files into ranking JSON and scans events.jsonl for corrupt or unreplayable ingests.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index bf8153d9c723af97122c9ffdd4a7cfe82e853bb6..a07734f089b466440c3ae6fc1087ce85fc24ce62 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1826,6 +1826,17 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "sorterc"
+version = "0.0.1"
+dependencies = [
+ "anyhow",
+ "clap",
+ "serde",
+ "serde_json",
+ "slugsocial-server",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
diff --git a/Cargo.toml b/Cargo.toml
index 149cbf07901eab57c593184ff8719a75d530f1da..25337acdd61e44b20f354c78fed4a88caf896280 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [workspace]
-members = ["server", "cli"]
+members = ["server", "cli", "sorterc"]
 resolver = "2"
 
 
diff --git a/agents.md b/agents.md
index d8b801e454fdf37e7ac6038b91a69f83b0746d59..ce646ed3cd7123be4732dccec4a6800467e651e7 100644
--- a/agents.md
+++ b/agents.md
@@ -93,6 +93,17 @@ SLUG_GOOGLE_CLIENT_SECRET=mock
 
 After OAuth completes, the pending-session poll returns a `slug_…` bearer token for API calls.
 
+### Dev-only offline tooling
+
+**`sorterc`** — workspace binary, not published via npm. Compiles `.sorter` files and lints `events.jsonl` without a server:
+
+```
+cargo run -p sorterc -- compile path/to/doc.sorter [--base events.jsonl] [--room public] [--pretty]
+cargo run -p sorterc -- scan path/to/events.jsonl [--pretty]
+```
+
+`compile` validates DSL, simulates ingest against empty (or `--base`) reducer state, and prints JSON rankings. `scan` reports corrupt JSONL lines and ingests that fail DSL replay.
+
 ### Testing
 
 - **Rust tests:** `cargo nextest run --workspace` (163 tests; requires `cargo-nextest`)
diff --git a/server/src/lib.rs b/server/src/lib.rs
index c1d477d21aea03aff00e6f0689b0b4379d0d68d2..ad8e31099c807fb5844acb16cd5086a2f19327a7 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -10,6 +10,7 @@ pub mod form_template;
 pub mod html;
 pub mod identity;
 pub mod middleware;
+pub mod offline;
 pub mod path_types;
 pub mod ranking;
 pub mod reducer;
diff --git a/server/src/offline.rs b/server/src/offline.rs
new file mode 100644
index 0000000000000000000000000000000000000000..54ad0ded096a305ef8454ab2cdd1c3af71b14f5d
--- /dev/null
+++ b/server/src/offline.rs
@@ -0,0 +1,333 @@
+//! Offline `.sorter` compilation and JSONL diagnostics (no network, no auth).
+
+use std::collections::HashSet;
+use std::path::Path;
+
+use serde::Serialize;
+use slug_types::{CheckScopeRanking, RankComponent, RankRow, paths::GardenItemUrl};
+
+use crate::{
+    api::{resolve_item, validate_ingest_document},
+    dsl,
+    events::{Event, Ingest},
+    path_types::ItemId,
+    reducer::{ReducerState, ScopeId, scope_from_room_wire},
+    scope_rank::build_children_rankings,
+};
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CompileStats {
+    pub items: usize,
+    pub votes: usize,
+    pub prose_blocks: usize,
+}
+
+#[derive(Debug, Serialize)]
+pub struct CompileResult {
+    pub ok: bool,
+    pub threads: Vec<String>,
+    pub rankings: Vec<CheckScopeRanking>,
+    pub stats: CompileStats,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CompileError {
+    pub ok: bool,
+    pub error: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hint: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct BadJsonLine {
+    pub line: usize,
+    pub message: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MalformedIngest {
+    pub line: usize,
+    pub id: String,
+    pub room_id: String,
+    pub thread_tag: String,
+    pub reason: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ScanResult {
+    pub ok: bool,
+    pub path: String,
+    pub total_lines: usize,
+    pub parsed_events: usize,
+    pub bad_json_lines: Vec<BadJsonLine>,
+    pub malformed_ingests: Vec<MalformedIngest>,
+    pub skipped_ingests: usize,
+}
+
+fn document_stats(doc: &dsl::Document) -> CompileStats {
+    let mut items = 0usize;
+    let mut votes = 0usize;
+    let mut prose_blocks = 0usize;
+    for stmt in &doc.statements {
+        match stmt {
+            dsl::Stmt::Item { .. } => items += 1,
+            dsl::Stmt::Vote { .. } => votes += 1,
+            dsl::Stmt::Prose { .. } => prose_blocks += 1,
+        }
+    }
+    CompileStats {
+        items,
+        votes,
+        prose_blocks,
+    }
+}
+
+fn threads_in_document(text: &str) -> Vec<String> {
+    let mut out = HashSet::new();
+    for line in text.lines() {
+        let trimmed = line.trim();
+        if !trimmed.starts_with('#') {
+            continue;
+        }
+        let rest = trimmed.trim_start_matches('#').trim();
+        if rest.is_empty() {
+            continue;
+        }
+        let tag = rest.split_whitespace().next().unwrap_or(rest);
+        let tag = tag.split(':').next().unwrap_or(tag).trim();
+        if tag.is_empty() {
+            continue;
+        }
+        out.insert(format!("#{}", crate::canonical_path::canonicalize_tag(tag)));
+    }
+    let mut tags: Vec<String> = out.into_iter().collect();
+    tags.sort();
+    tags
+}
+
+fn voted_parent_scopes(doc: &dsl::Document) -> Vec<ItemId> {
+    let mut parents = HashSet::new();
+    for stmt in &doc.statements {
+        if let dsl::Stmt::Vote { item1, item2, .. } = stmt {
+            if let (Ok(a), Ok(b)) = (resolve_item(item1), resolve_item(item2)) {
+                if let Some(p) = a.parent() {
+                    parents.insert(p);
+                }
+                if let Some(p) = b.parent() {
+                    parents.insert(p);
+                }
+            }
+        }
+    }
+    let mut out: Vec<ItemId> = parents.into_iter().collect();
+    out.sort();
+    out
+}
+
+fn rankings_for_simulated(
+    simulated: &ReducerState,
+    scope: &ScopeId,
+    room_wire: &str,
+    doc: &dsl::Document,
+) -> Vec<CheckScopeRanking> {
+    voted_parent_scopes(doc)
+        .iter()
+        .map(|parent| {
+            let scoped_content = simulated
+                .content_for_scope(&scope)
+                .unwrap_or_else(|| simulated.public());
+            let scoped = build_children_rankings(scoped_content, parent);
+            let components: Vec<RankComponent> = scoped
+                .component_rankings
+                .into_iter()
+                .map(|comp| RankComponent {
+                    pairs: comp.pairs,
+                    ranking: comp
+                        .ranked
+                        .into_iter()
+                        .map(|r| RankRow {
+                            item: GardenItemUrl::from_stored(&r.item, room_wire),
+                            score: r.score,
+                            percent: None,
+                        })
+                        .collect(),
+                })
+                .collect();
+            CheckScopeRanking {
+                parent: GardenItemUrl::from_stored(parent, room_wire).into_inner(),
+                components,
+                unranked_items: scoped
+                    .unranked_items
+                    .into_iter()
+                    .map(|it| GardenItemUrl::from_stored(&it, room_wire))
+                    .collect(),
+            }
+        })
+        .collect()
+}
+
+/// Validate and simulate one `.sorter` document against optional base reducer state.
+pub fn compile_document(
+    base: &ReducerState,
+    room: &str,
+    text: &str,
+) -> Result<CompileResult, CompileError> {
+    let room_key = room.trim();
+    let scope = scope_from_room_wire(room_key);
+    let validated = validate_ingest_document(base, text, &scope).map_err(|(_, message, hint)| {
+        CompileError {
+            ok: false,
+            error: message,
+            hint,
+        }
+    })?;
+
+    let event = Event::Ingest(Ingest {
+        ts: validated.ts,
+        id: uuid::Uuid::new_v4().to_string(),
+        raw: validated.raw_text.clone(),
+        principal: "offline".to_string(),
+        delegate: None,
+        room_id: room_key.to_string(),
+        thread_tag: "offline".to_string(),
+    });
+
+    let mut simulated = base.clone();
+    simulated.apply_event(event);
+
+    Ok(CompileResult {
+        ok: true,
+        threads: threads_in_document(text),
+        rankings: rankings_for_simulated(&simulated, &scope, room_key, &validated.doc),
+        stats: document_stats(&validated.doc),
+    })
+}
+
+fn ingest_parse_error(raw: &str) -> Option<String> {
+    dsl::parse_full(raw).err().map(|e| e.to_string())
+}
+
+fn load_events_from_jsonl(path: &Path) -> Result<(Vec<(usize, Event)>, Vec<BadJsonLine>), std::io::Error> {
+    let text = std::fs::read_to_string(path)?;
+    let mut events = Vec::new();
+    let mut bad_json_lines = Vec::new();
+    for (idx, line) in text.lines().enumerate() {
+        let line_no = idx + 1;
+        let trimmed = line.trim();
+        if trimmed.is_empty() {
+            continue;
+        }
+        match serde_json::from_str::<Event>(trimmed) {
+            Ok(ev) => events.push((line_no, ev)),
+            Err(e) => bad_json_lines.push(BadJsonLine {
+                line: line_no,
+                message: e.to_string(),
+            }),
+        }
+    }
+    Ok((events, bad_json_lines))
+}
+
+/// Replay a JSONL event log into reducer state (same rules as server boot).
+pub fn load_reducer_from_jsonl(path: &Path) -> Result<(ReducerState, Vec<BadJsonLine>), std::io::Error> {
+    let (events, bad_json_lines) = load_events_from_jsonl(path)?;
+    let mut state = ReducerState::default();
+    for (_line_no, ev) in events {
+        state.apply_event(ev);
+    }
+    Ok((state, bad_json_lines))
+}
+
+/// Scan an events.jsonl for corrupt JSON lines and ingests that fail DSL replay.
+pub fn scan_jsonl(path: &Path) -> Result<ScanResult, std::io::Error> {
+    let text = std::fs::read_to_string(path)?;
+    let total_lines = text.lines().count();
+    let (events, bad_json_lines) = load_events_from_jsonl(path)?;
+
+    let mut malformed_ingests = Vec::new();
+    let mut skipped_ingests = 0usize;
+    let mut state = ReducerState::default();
+    let parsed_events = events.len();
+
+    for (line_no, ev) in events {
+        if let Event::Ingest(ref ing) = ev {
+            if let Some(reason) = ingest_parse_error(&ing.raw) {
+                malformed_ingests.push(MalformedIngest {
+                    line: line_no,
+                    id: ing.id.clone(),
+                    room_id: ing.room_id.clone(),
+                    thread_tag: ing.thread_tag.clone(),
+                    reason,
+                });
+            }
+            let before = state.ingests_by_id.len();
+            state.apply_event(ev);
+            if state.ingests_by_id.len() == before {
+                skipped_ingests += 1;
+            }
+        } else {
+            state.apply_event(ev);
+        }
+    }
+
+    let ok = bad_json_lines.is_empty() && malformed_ingests.is_empty() && skipped_ingests == 0;
+
+    Ok(ScanResult {
+        ok,
+        path: path.display().to_string(),
+        total_lines,
+        parsed_events,
+        bad_json_lines,
+        malformed_ingests,
+        skipped_ingests,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TUTORIAL: &str = include_str!("../tests/fixtures/tutorial.sorter");
+
+    #[test]
+    fn compile_tutorial_fixture_emits_rankings() {
+        let result = compile_document(&ReducerState::default(), "public", TUTORIAL).unwrap();
+        assert!(result.ok);
+        assert!(!result.threads.is_empty());
+        assert!(result.stats.items >= 6);
+        assert!(result.stats.votes >= 6);
+        assert!(!result.rankings.is_empty());
+    }
+
+    #[test]
+    fn compile_rejects_vote_on_missing_item() {
+        let err = compile_document(
+            &ReducerState::default(),
+            "public",
+            "{ reason }\n~/missing/a 2:1 ~/missing/b",
+        )
+        .unwrap_err();
+        assert!(!err.ok);
+        assert!(err.error.contains("undefined"));
+    }
+
+    #[test]
+    fn scan

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