fix(gate): close the gaps in the plan-code guard, the button lists and the tooling

- planCodes: the quote and slash lookarounds let the commonest form through (a docstring or test
  title opening with a code, a slash pair); the two real exceptions (an episode titled "E1", ruff's
  E4/E7/E9) are now named and cut first, with cases that fail on the old pattern. audit_metrics
  counts by the same definition.
- button-primitive: both file lists live in the rule body, out of sight of the snapshot and the
  register; each is now pinned to its exact set of ui/ files (red when either is widened).
- check.sh --brief shows a short log whole and keeps the line before each hit, so ruff's rule and
  eslint's file path survive the excerpt.
- lint-changed runs prettier over every changed frontend file, as the gate does, not only code.
- CLAUDE.md and gates.md no longer claim the basedpyright baseline was found harmless: it was never
  triaged, and the reportOptional* entries are the likeliest real bugs.

frontend/src/lib/planCodes.contract.test.ts

@@ -19,15 +19,24 @@ const ALLOWED = new Set([
   "frontend/src/lib/planCodes.contract.test.ts",
   "scripts/audit_metrics.py",
 ]);
+// Named exceptions, cut from a line before it is matched: a test show's episode titled "E1" (the
+// whole string, quotes included) and ruff's default rule families. Anything else that looks like a
+// code is one — a docstring or a test title opening with `"""E30:` / `it("E36:` included.
+const NOT_CODES = /"E\d{1,2}"|\bE4\/E7\/E9\b/g;
 const PLAN_CODES = [
-  // an epic (`E28`, `E9.5`) or an older roadmap item (`R14`) — not `E2E`, not a ruff rule family
-  // (`E4/E7/E9`), not a TV episode (`S2 · E5`, a test show's episode titled "E1")
-  /(?<!S\d{1,2}\s?·?\s?)(?<![/"])\b(?:E\d{1,2}(?:\.\d+)?|R\d{1,2})\b(?![/"E])/,
+  // an epic (`E28`, `E9.5`, `E28/E30`) or an older roadmap item (`R14`) — not `E2E`, not a TV
+  // episode (`S2 · E5`)
+  /(?<!S\d{1,2}\s?·?\s?)\b(?:E\d{1,2}(?:\.\d+)?|R\d{1,2})\b(?!E)/,
   // a sprint cited on its own (`(S6)`, `S3e2`) or a review round (`round 4`, `deep-review`) — not
   // `S3h`, the media-card decision docs/DESIGN.md is headed by and the design lab labels
   /\(S\d{1,2}[a-z]?\d?\)|\bS(?!3h\b)\d{1,2}[a-z]\d?\b|\b[Rr]ound[ -]\d|deep-review/,
 ];
 
+const isPlanCode = (line: string) => {
+  const rest = line.replace(NOT_CODES, "");
+  return PLAN_CODES.some((re) => re.test(rest));
+};
+
 function tracked(): string[] {
   const out = execFileSync(
     "git",
@@ -44,15 +53,34 @@ function tracked(): string[] {
 }
 
 describe("plan codes", () => {
+  it("are recognised in every form a citation takes", () => {
+    const cited = [
+      '"""E30: the new sink.',
+      'it("E36: keeps x", () => {',
+      "// both sides (E28/E30)",
+      "# the roadmap's R6/R7 pair",
+      "// held since E9.5",
+      "// (S6) moved it",
+      "// deep-review round 4 found it",
+    ];
+    const clean = [
+      'title="E1",',
+      "# ruff's default rule set (E4/E7/E9 + F)",
+      "// an E2E run",
+      "// S2 · E5 is the second episode",
+      "// the S3h media card",
+    ];
+    expect(cited.filter((l) => !isPlanCode(l))).toEqual([]);
+    expect(clean.filter(isPlanCode)).toEqual([]);
+  });
+
   it("are not cited in the code", () => {
     const files = tracked();
     expect(files.length).toBeGreaterThan(1000); // a scan that reads nothing is green over nothing
     const hits = files.flatMap((f) =>
       readFileSync(new URL(f, REPO), "utf-8")
         .split("\n")
-        .flatMap((line, i) =>
-          PLAN_CODES.some((re) => re.test(line)) ? [`${f}:${i + 1}: ${line.trim()}`] : [],
-        ),
+        .flatMap((line, i) => (isPlanCode(line) ? [`${f}:${i + 1}: ${line.trim()}`] : [])),
     );
     expect(hits).toEqual([]);
   });