docs(6210): acceptance sweep — src, scripts and frontend leftovers described in the present tense

The acceptance greps found what the per-area passes missed:

- src/scribe: "Phase 7/8" removal notes in projects, settings and
  user_profile; a paragraph promising an auto-summary side effect that no
  longer exists; user_profile's claim that "upcoming MCP profile tools" read
  the profile, which nothing does; an instance count and instance rule
  titles in plugin_context; "MILESTONE 323 DECIDED" in rulebooks.
- scripts/: check_plugin's header and inline comments were a history of
  the incidents behind each guard, with issue numbers in two failure
  messages; check_dangling_styles named this app's classes as its examples;
  check_design_tokens, measure_duplication and mint_plugin_version cited
  issues and checklists.
- frontend/src: forty-odd comments with four-digit issue numbers that the
  earlier frontend scan filtered out as hex colours, plus "used to" and
  "Phase N" notes.

Kept: illustrative ids (`#4181` as a bare-id example, `PR #198`), migration
Create Date headers and one migration's dated data floor, and the plugin
skills' worked examples of how to cite a record.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/api/client.ts

@@ -41,8 +41,8 @@ async function handleResponse<T>(res: Response, path: string): Promise<T> {
 /**
  * The server's `{"error": "..."}` message from a failed call, or `fallback`
  * when the failure carried none (network error, non-JSON body). The one place
- * the error envelope is unpacked on the client — views used to restate this
- * as a six-line `"body" in e` branch at every catch site.
+ * the error envelope is unpacked on the client, so no view restates it as a
+ * `"body" in e` branch at its catch site.
  */
 export function apiErrorMessage(e: unknown, fallback: string): string {
   if (e && typeof e === "object" && "body" in e) {
@@ -61,8 +61,7 @@ export function apiErrorMessage(e: unknown, fallback: string): string {
  * surface can show for "pending forever" that is not a lie.
  *
  * 30s is chosen to be longer than anything healthy: it has to clear a cold
- * embedding call and a list view under connection-pool contention (#2384 had
- * /api/projects fanning 25 concurrent sessions at a 15-connection pool), so
+ * embedding call and a list view under connection-pool contention, so
  * tripping it means something is genuinely wrong rather than merely busy. Slow
  * BY DESIGN is a different case and passes its own value — see the callers in
  * SettingsView that do.

frontend/src/api/designSystems.ts

@@ -1,5 +1,5 @@
 /**
- * Design systems — the stylesheet held as records (milestone #254).
+ * Design systems — the stylesheet held as records.
  *
  * A design system is a named set of tokens with an optional parent. A system
  * with no parent is a "family"; one with a parent holds ONLY what it changes,
@@ -82,8 +82,8 @@ export interface StarterRoleGroup {
 }
 
 /** The starter token ROLES offered at creation — names and purposes, never
- *  values. A default palette would be one install's taste shipped as product
- *  (rule #115), so the values are always the operator's to fill. */
+ *  values. A default palette would be one install's taste shipped as product,
+ *  so the values are always the operator's to fill. */
 export const listStarterRoleGroups = () =>
   apiGet<{ groups: StarterRoleGroup[]; default_prefix: string }>(
     "/api/design-systems/starter-roles",

frontend/src/api/lessons.ts

@@ -88,7 +88,7 @@ export interface Lesson {
   no_rule?: { why: string; judged_at: string | null };
   /** Sent by a create or update that recorded "no rule fits" when that answer
    *  completes a group: lessons with no rule that keep landing in one
-   *  situation, which may want a rule written for it (#4634). */
+   *  situation, which may want a rule written for it. */
   convergence?: { lessons: { id: number; title: string }[] };
   /** Set when another user owns this record. */
   shared?: boolean;

frontend/src/api/snippets.ts

@@ -30,7 +30,7 @@ export interface SnippetFields {
    *  no `locations`/`tags` predates that attribution and cannot be un-merged. */
   merged_from: { id: number; locations?: SnippetLocation[]; tags?: string[] }[];
   code: string;
-  /** Free text that is not the situation — why, history, caveats (#4378).
+  /** Free text that is not the situation — why, history, caveats.
    *  Kept out of `when_to_use`, which the snippet is ranked on. */
   notes: string;
 }

frontend/src/api/systems.ts

@@ -24,7 +24,7 @@ export interface System {
   open_issue_count: number;
   /**
    * How often this area's rulings were shown to a session because its files
-   * were touched (`surfaced_count`), and how often it was opened (#4769).
+   * were touched (`surfaced_count`), and how often it was opened.
    * Present on the list and detail reads; optional because a System returned
    * by a create or update carries none.
    */
@@ -45,7 +45,7 @@ export async function listSystems(projectId: number): Promise<System[]> {
  * caller to accept or ignore.
  *
  * A same-named System in this project is a 409 ApiError carrying
- * `{duplicate, existing_id}` — the same gate the MCP door enforces (#2482).
+ * `{duplicate, existing_id}` — the same gate the MCP door enforces.
  */
 export interface CreatedSystem extends System {
   canonical_suggestion?: CanonicalMatch;