docs: archive stale findings docs (work completed)

Both findings docs described a codebase that no longer exists — their
headline 'Critical'/'P0' items (server.ts/app.js/types.ts splits, the
{WORKING_DIR} placeholder bug) are all resolved. Moved to docs/archive/
with dated banners so they read as history, not a live TODO.

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

docs/archive/cleanup-findings.md

@@ -1,3 +1,9 @@
+> **⚠️ ARCHIVED 2026-05-21 — superseded, kept for history.**
+> The headline items here were verified resolved: the P0 `{WORKING_DIR}` placeholder
+> is now replaced (`plan-orchestrator.ts:431`), and the "~66 dead functions in app.js"
+> are gone (app.js was modularized 15K→3K LOC). A fresh `npm run knip` sweep on
+> 2026-05-21 found only a handful of unused test helpers. Do not treat this as a live TODO.
+
 # Codebase Cleanup Findings
 
 Compiled from parallel analysis of the entire Codeman codebase by 3 research agents (2026-02-19).

docs/archive/code-structure-findings.md

@@ -1,3 +1,9 @@
+> **⚠️ ARCHIVED 2026-05-21 — superseded, kept for history.**
+> The "Critical" structural items here are done: `server.ts` 6,736→2,065 LOC,
+> `app.js` 15,196→3,083 LOC, `types.ts` 1,443→12 LOC (now a barrel → `src/types/`).
+> The phase plans that executed this work are in `docs/archive/phase*-plan.md`.
+> Do not treat this as a live TODO; see CLAUDE.md for current architecture.
+
 # Code Structure & Quality Findings
 
 **Date**: 2026-02-28