chore(format): prettier sweep over phase-2 touched files + stale planning docs

Picks up the prettier line-wraps the v1.5 phase-1 planning docs and
codex-protocol-spec.md missed, and brings the redact.ts + insights
generate route test into the project's standard form. No behaviour
change — pnpm format:check now passes clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/api/insights/generate/__tests__/route.test.ts

@@ -113,7 +113,7 @@ describe("POST /api/insights/generate — provider error mapping", () => {
   it("maps a 401 from the provider to 422 with a readable message", async () => {
     const err = Object.assign(new Error("OpenAI request failed (401)"), {
       httpStatus: 401,
-      bodyExcerpt: "{\"error\":{\"code\":\"invalid_api_key\"}}",
+      bodyExcerpt: '{"error":{"code":"invalid_api_key"}}',
     });
     makeProviderThatThrows(err);