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Commit A introduces a substantial new URL canonicalization subsystem: a semantic graph with traversal logic, a graph builder with validation, URL parsing and normalization, generic fallback behavior, breadcrumb generation, support for Reddit and YouTube URL patterns, and an extensive test suite covering parsing, canonicalization, traversal, security-related encoding, and regressions. It adds multiple new modules and hundreds of lines of functionality. Commit B is a small UI cleanup that removes a preview section from the HTML output. While potentially useful, it is a minor deletion compared with the broad architectural feature and test coverage added in Commit A.

Commit A introduces an entire URL canonicalization system: DFA-based graph traversal, parsing utilities, a builder with validation, generic fallback logic, and extensive tests covering many edge cases. It’s a large, foundational feature addition. Commit B simply removes a small HTML section, which is minor in scope and impact.

Side A introduces a comprehensive URL canonicalization system with multiple new modules (graph, builder, parser), extensive logic, and a large suite of unit and end-to-end tests—over a thousand lines of substantive functionality. Side B merely removes a small HTML preview section (a few lines). The scope, complexity, and impact of Side A far exceed Side B.

Commit B makes a substantially larger contribution. It introduces a new `RouteContext` abstraction with a dedicated routing module, exports it for use across the HTML layer, and adds a detailed engineering plan documenting the intended `ItemId`/routing refactor, migration phases, risks, and testing strategy. While much of the added content is documentation, it also includes reusable code that establishes a new API for route generation. Commit A is a small cleanup that removes a UI preview section from a template, which is a much narrower change with limited architectural impact.

Side B introduces a substantial architectural plan document and a new routing module with supporting exports, adding meaningful structure and future guidance to the codebase. Side A only removes a small HTML section with minimal impact.

Commit A removes a small HTML section (a few lines of DOM). Commit B introduces a substantial architectural planning document (~155 lines) plus a new routing module with RouteContext (~70+ lines) and integrates it into the HTML module. This adds significant structural groundwork and documentation for future refactoring, far outweighing the minor UI removal in A.

Side A introduces a substantial, well-tested URL canonicalization system (graph traversal, builder with validation, parsing, tracking-param stripping) with extensive test coverage, representing real lasting design work. Side B is a trivial 4-line deletion removing a dead DOM section, providing minimal but real value with no accompanying tests or explanation of impact.

Side A adds a full URL canonicalization stack (DFA graph, builder with link validation, parse/normalize, generic fallback) plus extensive regression tests for Reddit/YouTube equivalence and breadcrumbs. Side B only deletes a small unused vote-compare preview DOM block, a minor UI cleanup with little lasting design impact.

Side A introduces a substantial new URL canonicalization subsystem: parser, semantic graph with validated builder, traversal logic, canonical URL and breadcrumb generation, generic fallback behavior, and extensive unit/end-to-end tests covering Reddit, YouTube, aliases, query normalization, and regressions. Side B only removes a small HTML preview section from the vote comparison page, deleting a UI block without adding comparable infrastructure or functionality.

Side A introduces an entire URL canonicalization system (graph traversal, parsing, normalization, generic fallback) with extensive tests, adding substantial long-term functionality. Side B only removes a small DOM section (`vote-compare-preview-wrap`) with no evident architectural or bug-fixing impact.

Side A introduces an entire URL canonicalization subsystem (graph.rs, graph_builder.rs, parse.rs) with DFA-based traversal, host normalization, tracking-parameter stripping, generic fallback logic, and extensive unit and end-to-end tests. Side B merely removes a small HTML preview section (`vote-compare-preview-wrap`) from a template without adding new functionality. The architectural addition and comprehensive test coverage in A provide far greater lasting value.

Commit B introduces a substantive new abstraction (RouteContext wrapping ThreadNav with concrete methods) plus a detailed migration plan document that provides real architectural direction and lasting reference value for future refactors. Commit A is a trivial one-line-block removal of dead HTML markup, which is useful cleanup but minor in scope and impact compared to B's added scaffolding and documentation.

B adds lasting structure: a real RouteContext API in routing.rs (and re-exports) plus a concrete ItemId migration plan that unblocks a core identity/routing refactor. A only deletes a small unused vote-preview DOM block—a correct cleanup, but far narrower impact than B’s design foundation.

Side B introduces a new `RouteContext` abstraction in `server/src/html/routing.rs`, re-exports it from `html/mod.rs`, and centralizes scoped URL-building behind methods like `item_href`, `thread_url`, and `garden_root_url`, creating a reusable foundation for future routing changes. Side A only removes a `vote-compare-preview` HTML block from `garden.rs`, which is a localized UI cleanup with much narrower long-term impact.

A simply removes a small HTML preview block (`vote-compare-preview-wrap`), reducing UI without clear functional gain. B introduces a new `routing.rs` module with `RouteContext` abstraction and wires it into `html/mod.rs`, establishing a centralized path-building design that affects future HTML and routing consistency, plus a detailed plan guiding a large refactor.

Side A simply deletes a small HTML preview section (`vote-compare-preview-wrap`) from `garden.rs`, removing UI without adding structural improvement. Side B adds a substantial architectural plan (`plan.md`) and introduces a new `RouteContext` abstraction in `server/src/html/routing.rs`, re-exported in `html/mod.rs`, establishing a centralized routing layer for scoped href generation—an extensible design change with lasting impact.