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Side B implements a substantial, working feature (SSE-based entity fetch streaming with proper job result tracking, oneshot notification, richer error handling/logging, and updated JS client + integration test), representing real functional value. Side A is merely deleting a leftover unused file, which is a trivial cleanup with no functional impact.

A only removes an unused timeline.rs module (dead-code cleanup). B delivers lasting architecture: SSE-based entity fetch with oneshot job results, a dedicated fetch module, richer Reddit worker outcomes/error paths, and matching UI/JS/test updates—real product and design value beyond deletion.

Side B introduces substantial new functionality by refactoring entity fetching into an SSE-based streaming flow, adding a dedicated fetch module, asynchronous completion notifications with oneshot channels, client-side SSE handling, and corresponding integration tests. Side A only deletes an apparently vestigial `timeline.rs` file without replacing or improving functionality, so its lasting project value is much smaller.

Side A is a substantial functional refactor: it converts entity fetching to a real SSE pipeline (new fetch module, oneshot result notification, tracing, client JS SSE parsing, updated tests), delivering real architectural and UX improvements. Side B is merely a one-line addition to a notes file with no code change, providing negligible lasting value.

Commit A delivers a real architectural upgrade: entity fetch becomes an SSE stream with oneshot completion, a dedicated fetch module, richer FetchJobResult handling in the Reddit worker, and matching JS/test updates. Commit B only appends two lines of personal notes to notes.tdsl with no code or product impact.

Side A implements a substantive architectural change: it adds SSE-based streaming for entity fetches, introduces a fetch module with streaming HTML updates, extends the Reddit worker with completion notifications via oneshot channels and explicit FetchJobResult states, updates the client to consume SSE, and adapts tests accordingly. Side B only appends a developer note about improving thread error propagation and does not change project behavior.

Side B introduces a substantive architectural change (SSE-based fetch pipeline with oneshot result signaling, structured FetchJobResult states, new fetch module, extensive tracing, and JS SSE consumer) that fixes a real UX gap (async fetch feedback) and is validated by an updated integration test. Side A is a small, focused UI grouping fix with a good regression test, but it's much narrower in scope and impact compared to B's cross-cutting feature work despite B's Cargo.lock noise and unrelated docstring removals.

B turns fire-and-forget entity fetch into a real SSE pipeline (oneshot FetchJobResult through the Reddit worker, dedicated fetch module, client SSE morph/error handling, and updated integration coverage)—lasting architecture and UX. A only splits each unranked sibling into its own nav group plus one unit test, a correct but narrow UI tweak.

Side B introduces a substantial architectural improvement by moving entity fetching to an SSE-based workflow, adding a dedicated fetch module, asynchronous streaming, completion/error signaling via oneshot channels, client-side SSE handling, and integration tests for the new behavior. Side A is a focused UI correctness fix that changes unranked siblings from a single group into one group per item and adds a regression test, but its scope and long-term impact are much smaller than the new fetch infrastructure.

Side B implements a substantive architectural improvement: converting entity fetch from fire-and-forget to a proper SSE stream with typed FetchJobResult outcomes, oneshot completion signaling, richer tracing, and updated tests/client JS to consume the stream—this is a real feature/bugfix with lasting design value. Side A is a smaller UI polish commit (vote counts on garden rows, HUD unpin-via-POST instead of link) plus minor test additions, which is useful but more incremental and narrower in scope than B's protocol-level refactor.

B’s lasting value is the end-to-end fetch redesign: oneshot FetchJobResult from the Reddit worker, a dedicated fetch module, and SSE (fetching/complete/error) with client consumption so the UI can wait on real outcomes instead of fire-and-forget morph. A is solid but narrower—correct pin HUD unpin via set_garden_pin clear, pairwise vote counts on garden icons, plus tests/CSS—and does not change core async design the way B does.

Side B introduces a substantial architectural improvement by moving entity fetching from a synchronous JS-morph response to an SSE-based workflow, adding a dedicated fetch module, streaming progress/completion events, worker completion notifications via oneshot channels, and client-side SSE handling. Side A improves the garden UI with pairwise vote counts, HUD unpin behavior, styling, and tests, but these are localized UX enhancements rather than a broad infrastructure change.

Side B implements a real functional improvement (SSE-based async entity fetch with proper job result tracking, rate-limit handling, and updated JS/client integration plus adjusted integration test), delivering concrete new user-facing behavior. Side A is a large but purely mechanical type-renaming/relocation refactor (moving string helpers into newtypes) with no behavior change and even removes some test coverage duplicated elsewhere, offering less lasting functional value despite its size.

A permanently centralizes path canonicalization and room-aware hrefs into slug-types (GardenItemUrl/ForumThreadUrl/TildeOntologyPath) and types the API/RPC surface, replacing ad-hoc string helpers with a shared identity model. B’s SSE fetch pipeline and Reddit oneshot completion are real UX/architecture gains, but they are localized to one import flow and mix in logging/churn, so they add less cross-cutting lasting value than A’s path core.

Side A performs a substantial architectural refactor by moving path canonicalization and URL construction into a shared `types::paths` module, replacing ad hoc string helpers with strongly typed `GardenItemUrl`, `ForumThreadUrl`, and `TildeOntologyPath` throughout the API and shared types. This centralizes path identity, reduces duplication, and makes JSON/RPC interfaces more type-safe, while preserving behavior via migrated tests; Side B adds useful SSE-based Reddit fetch streaming and UI updates, but it is a more localized feature with additional dependencies rather than a cross-cutting improvement to core project design.

Side B fixes a real functional gap: the old FetchEntity handler queued an async fetch and immediately morphed with (likely stale) data, giving no feedback when the fetch actually completed; the SSE-based fetch module now streams fetching→complete/error and morphs the actual result, which is a genuine architectural improvement with oneshot-based job result tracking. Side A is a well-tested but purely additive feature (reddit post thumbnails/images) that adds value but is lower-impact than fixing the fetch completion flow, though B does regress by removing a few existing reddit.rs unit tests without replacement.

B turns fire-and-forget entity import into a proper SSE completion path (oneshot results on the Reddit worker, fetch module, client stream handling, integration test update), which is lasting infrastructure for how imports work. A is real product value—EntityData image/link fields, render/reddit cards, thumbs in rank lists, CSS, and a fixture test—but it is additive UI on top of that pipeline rather than a structural fix.

Side B introduces a substantive architectural change by moving entity fetching to an SSE-based workflow, adding asynchronous completion notifications with oneshot channels, integrating streaming UI updates, and wiring the backend, frontend, and tests together for a more responsive fetch pipeline. Side A adds valuable Reddit-specific rendering (thumbnails, full images, outbound links, specialized markup, and parsing/tests), but it is primarily a feature enhancement layered on top of existing behavior rather than a broader infrastructure improvement.

A delivers a real feature (SSE-based entity fetch with proper job completion signaling via oneshot channels, richer tracing, and updated JS/CLI/integration tests), fixing a previously fire-and-forget fetch flow. B is a decent simplification (removing unused ThreadVisibility/RoomState complexity and adding a CLI room-create command) but is smaller in scope and mostly removes dead abstraction rather than adding new durable capability, plus it touches CLI/docs/tests for a fairly narrow feature.

Commit A delivers a real end-to-end capability: entity fetch becomes an SSE stream with fetching/complete/error events, oneshot FetchJobResult completion from the Reddit worker, a dedicated fetch module, and matching JS/client plus integration-test updates. Commit B is valuable lasting design (drop room visibility, rooms as a HashSet, wire CLI `room create` and docs), but it mostly simplifies an existing RoomCreate path rather than adding comparable multi-layer product behavior.

Side A introduces a substantive new asynchronous fetch flow: it adds an SSE-based entity import pipeline, streams fetch progress and completion to the UI, wires Reddit fetch completion through oneshot notifications, and updates the browser client to consume event streams instead of only JavaScript responses. Side B mainly exposes an existing room-creation capability through the CLI while simplifying the data model by removing room visibility, but most changes are API cleanup, documentation, and plumbing rather than adding comparable runtime functionality.

Side A converts a synchronous fetch action into a proper SSE streaming flow with progress states, error handling, retry/backoff via a oneshot result channel, and improved diagnostic logging in the reddit worker, while also cleaning up module structure (moving fetch UI code into its own module) — a real behavioral improvement with matching test updates. Side B adds a standalone dev CLI (sorterc) that reuses existing server logic for offline compile/lint; it's useful tooling but is additive/peripheral, mostly wrapping existing validate/ranking code without changing core system behavior or fixing bugs.

A redesigns a core user path: Reddit entity fetch becomes an awaited SSE stream with oneshot job results, progressive UI morphs, and richer failure handling in the worker—lasting product architecture—versus B’s solid but peripheral offline compile/scan binary. A’s gain is tempered by extra logging and some removed unit tests, so the margin is meaningful but not huge.

Side A introduces a substantive architectural change: entity fetching is converted from a fire-and-forget JS response into an SSE-based workflow with progress/completion events, coordinated via oneshot notifications from the Reddit worker, plus the necessary client-side stream handling and refactoring of fetch-related HTML into its own module. Side B adds a useful developer-only offline tool (`sorterc`) for compiling `.sorter` files and linting `events.jsonl`, but it primarily extends tooling rather than changing the runtime behavior of the application, so its long-term project impact is somewhat narrower.

Side A implements a coherent, testable improvement (SSE-based entity fetch with proper job-result signaling, worker instrumentation, and updated tests/JS), even though it removes a few existing unit tests. Side B mixes legitimate new room/auth/session functionality with a large amount of noise, including committing an AI-generated design-discussion markdown file (plan2.md) that has no code value and clutters the repo, which hurts its overall lasting value despite the real feature work.

Side B permanently wires multi-room UI (ThreadNav abstraction, /r/* routes with ACL checks, compose/post forms via rpc_post_with_bearer, cookie sessions + login/logout) turning public-only threads into a functional web product; Side A mainly refactors one Reddit fetch path to SSE (new fetch/ mod, oneshot results, JS consumer) which improves polish but is narrower and more internal.

Side B substantially expands core web functionality by wiring browser session cookies into authentication, adding login/logout, enabling authenticated web posting through the existing RPC layer, and introducing room-aware routing with access control for private forums. Side A usefully refactors Reddit entity fetching into an SSE-based streaming flow with progress/error events and modularizes fetch UI, but it is more localized, whereas B establishes broader application capabilities that affect authentication, routing, and posting across the project.

Side B is a substantial feature refactor converting entity fetch from a fire-and-forget JS morph into a proper SSE streaming flow with job-result signaling (oneshot channels, FetchJobResult enum, worker notifications), plus richer tracing, module reorganization (new fetch module), client-side SSE parsing, and updated integration tests. Side A is a small but real bugfix (moving a zero-ratio guard earlier) with a corresponding test update, which is correct and valuable but far narrower in scope and impact than B's architectural improvement to a core interaction flow.

A is a precise correctness fix: zero-ratio votes no longer call ensure_item or mark voted_pairs, eliminating ghost index entries, with tests updated to match. B delivers real SSE fetch UX and module extraction, but much of the diff is relocation, tracing noise, lockfile churn, and dropped unit tests, so it is more diffuse lasting value than A's targeted data-integrity fix.

Side A fixes a real correctness bug by moving the zero-ratio guard before `ensure_item` and `voted_pairs.insert`, preventing ghost items and incorrectly recorded voted pairs. It also updates the test to verify that no items, edges, or voted pairs are registered, whereas Side B is a large refactor/feature addition with dependency changes and code movement but no similarly clear, focused correctness improvement.

B fixes a concrete performance bug (scan was doing a full reducer replay including rank centrality, which is slow) with a single-pass parse check, adds a genuinely useful debugging tool (compile --ingest) with tests, and improves error surfacing without removing existing coverage. A delivers a real SSE-streaming improvement for fetch UX, but it also strips out three existing unit tests without replacement and pads the reddit worker with a large volume of tracing::debug! calls that add noise more than lasting design value.

A lands a lasting product design change: fetch becomes a oneshot-backed SSE stream with FetchJobResult, a dedicated fetch module, and real client progressive morph/error handling instead of fire-and-forget queueing. B is strong, focused tooling (fast parse-only scan, full parse_error surfaces, compile --ingest), but it improves offline DX rather than core runtime behavior and is narrower in impact.

Side B adds substantial offline tooling improvements: it introduces `compile --ingest` to replay prior events and compile a single ingest from a log, makes `scan` a fast parse-only pass instead of replaying the full reducer, and surfaces detailed `parse_error` information in both data structures and CLI output. Side A implements an SSE-based fetch flow with UI refactoring and async coordination, but much of the patch is infrastructure and code movement around an existing fetch feature, whereas Side B delivers durable developer-facing functionality and performance improvements.

Both are substantial infra additions, but B fixes a real correctness/UX issue (fetch_entity returning immediately without waiting for the actual reddit fetch, replaced with a proper SSE stream with fetching/complete/error states and oneshot completion signaling), adds meaningful observability (tracing::debug throughout reddit worker), and updates the integration test to verify actual behavior end-to-end. A is a solid new feature (POST /ui plumbing and form templating) but is more scaffolding/wiring without fixing a functional gap, and B's SSE mechanism is the more durable, correctness-improving design.

A introduces lasting core design: form_template hole-filling, typed HtmlUiAction, a unified POST /ui dispatcher, and shared run_* web_post paths, plus the expandable new-thread UI—reusable infrastructure with tests. B’s SSE fetch pipeline and oneshot FetchJobResult are real improvements to one flow, but much of the diff is logging, module moves, lockfile/deps, and trimmed tests rather than broader foundational value.

Side A introduces a substantial new browser UI command architecture: a unified POST /ui endpoint, structured HtmlUiAction parsing with JSON form templates, reusable web-post handlers, and lazy expansion of new-thread forms with permission checks. Side B adds useful SSE-based entity fetch streaming and refactors fetch UI into its own module, but much of the patch is infrastructure, logging, and code movement around an existing fetch feature, making its lasting architectural impact somewhat smaller.

B fixes a real correctness bug (root/tilde canonicalization mismatch causing top-level ontology children to be mis-keyed), adds targeted unit/integration/browser tests validating the fix, and introduces a clear invariant (SLUG_TILDE_ONTOLOGY_ROOT normalization) reused across modules. A is a substantial refactor moving fetch logic into a new SSE-based module with real functional improvement (async streaming, job-completion notification) but is mostly architectural churn/rename plus feature addition rather than a bugfix, and removes some existing test coverage without clearly stronger regression guarantees than B's added tests.

B fixes foundational CanonicalItemUrl storage identity (unifying `https://slug.social/~` vs `…/~/`, normalized_storage on rankings/lookups) so garden root children and sibling-rank actually resolve, with unit/integration/browser coverage. A is a large, useful fetch→SSE redesign plus module split and worker oneshots, but it mostly upgrades an already-working import path rather than correcting core graph key semantics.

Side B fixes a substantive correctness issue around canonical ontology root paths by introducing normalized storage for `~/`, updating lookups to use normalized keys, centralizing tilde-path conversion, and adding extensive regression tests covering root handling, rankings, and routing. Side A mainly refactors the fetch flow into an SSE-based implementation and reorganizes HTML helpers while adding logging and async plumbing, which is valuable but is largely an architectural/UI change rather than a fundamental correctness fix.

Side B fixes a real design flaw (ranking collapsed to per-contributor comparisons, short-circuiting when only one contributor existed even with multiple commits) with a coherent refactor that ranks per-commit, rolls up scores, updates evidence pages, and adds targeted tests covering the new behavior. Side A is a substantial SSE-streaming feature addition for Reddit fetch UX with good logging, but it's more feature churn/plumbing than a structural correctness fix, and it also deletes some existing unit tests without clear justification.

B fixes lasting ranking design by pairwise-scoring every eligible commit (including multiple commits from one author) and rolling scores up, instead of short-circuiting on a single contributor and bundling patches; it also persists/surfaces commit_ranking on epoch pages with matching tests. A is a solid product refactor (SSE fetch stream, oneshot FetchJobResult, moved HTML/JS), but much of the diff is module relocation, dependency/lock churn, and logging rather than a governance-level correctness fix.

Side B fixes the ranking model to compare individual commits rather than short-circuiting on contributors, introduces per-commit ranking with contributor rollups, updates prompts/evidence, and adds tests covering same-contributor multi-commit cases. Side A adds a useful SSE-based entity fetch flow with streaming UI updates and worker completion signaling, but it is partly a refactor plus feature split, while Side B corrects a core ownership-allocation algorithm in a way that more directly affects project correctness.