docs: codebase review + documentation maintenance pass

Full review (plans/2026-07-17-codebase-review-and-cleanup.md) covering Go,
web SPA, and docs. Applied low-risk doc/tooling fixes; code refactors and
dead-code deletions are listed as actionable recommendations pending approval.

Doc fixes:
- AGENTS.md: remove ghost of retired request_execution (contradicted the
  retire notice above it); fix knowledge/wiki/ -> archive/knowledge/;
  replace brittle counts (33 tools, 36 docs, 20 checks) with pointers to
  source; drop point-in-time dates.
- OIKOS.md: fix broken plan link (now in done/); 001-011 -> 001-020;
  15 MCP tools -> pointer; replace hardcoded knowledge counts.
- README.md: 15 tools -> pointer; fix wails plan link (now in done/);
  complete internal/ package list (add checkdefaults, observability, safego);
  add cmd/desktop/ to repo layout.
- commands.md, page-templates.md: fix broken links; HERMES.md -> NOMOS.md.

Plans housekeeping:
- Move 4 done 2026-07-14 plans from plans/ to plans/done/.
- Reconcile plans/index.md: add the 2 missing 2026-07-14 entries and the
  2 missing 2026-07-15 done entries; add this review.
- Fix stale plan path in migrations/020 comment.

New docs:
- docs/index.md and docs/operations/README.md (folder READMEs per
  writing-style.md).

Tooling:
- web/package.json: add check/typecheck/lint scripts + svelte-check devDep.
- Makefile: desktop-package version now reads from VERSION file instead of
  hardcoded 0.1.0.

VERSION 0.7.6 -> 0.7.7 (patch: docs + tooling only).

plans/index.md

@@ -14,10 +14,9 @@ went sideways, open an investigation.
 | 2026-07-08 | [Liveness, drift, and UX cohesion](2026-07-08-liveness-drift-and-ux-cohesion.md) | In Progress — Phase 5 deferred |
 | 2026-07-10 | [General gated execution: unlimited actions, gated by risk](2026-07-10-general-gated-execution.md) | In Progress — `request_execution` enum retired (60effcb); only auto-act revival (item 10) still open |
 | 2026-07-11 | [Nomos agent code review: gaps and improvement plan](2026-07-11-nomos-agent-code-review.md) | In Progress — only C1 (unauthenticated nomos gateway) still open, deferred |
-| 2026-07-14 | [Session reliability & UX audit](2026-07-14-session-reliability-and-ux-audit.md) | Done — all 21 fixes deployed |
-| 2026-07-14 | [Tool timeline in sidebar](2026-07-14-tool-timeline-sidebar.md) | Done — deployed v0.3.2 |
-| 2026-07-14 | [Unified agent activity indicator](2026-07-14-unified-agent-indicator.md) | Done — deployed v0.3.3 |
-| 2026-07-14 | [Post-fix session remainders: empty responses & plan drift](2026-07-14-post-fix-session-remainders.md) | Done — all 18 fixes shipped, eval-validated (4/4 golden evals pass), committed (337d577 + 3de359b + dd3076a), deployed v0.5.3. OIDC token-refresh fix (PM) also shipped (3b98097) |
+| 2026-07-14 | [Activity gaps](2026-07-14-activity-gaps.md) | In Progress |
+| 2026-07-14 | [Activity timeline](2026-07-14-activity-timeline.md) | In Progress |
+| 2026-07-17 | [Codebase review, lint audit, and documentation maintenance](2026-07-17-codebase-review-and-cleanup.md) | Report delivered — doc/tooling fixes applied; code refactors pending |
 
 ## Done
 
@@ -49,6 +48,12 @@ See [`done/`](done/) for executed plans:
 | 2026-07-11 | [Task completion safety net: every live task is stuck "Running"](done/2026-07-11-task-completion-safety-net.md) |
 | 2026-07-12 | [Wails desktop application](done/2026-07-12-wails-desktop-app.md) |
 | 2026-07-13 | [MCP tool apps: custom in-chat renderers](done/2026-07-13-mcp-tool-apps-custom-chat-renderers.md) |
+| 2026-07-14 | [Session reliability & UX audit](done/2026-07-14-session-reliability-and-ux-audit.md) |
+| 2026-07-14 | [Tool timeline in sidebar](done/2026-07-14-tool-timeline-sidebar.md) |
+| 2026-07-14 | [Unified agent activity indicator](done/2026-07-14-unified-agent-indicator.md) |
+| 2026-07-14 | [Post-fix session remainders: empty responses & plan drift](done/2026-07-14-post-fix-session-remainders.md) |
+| 2026-07-15 | [Plan-first and iteration](done/2026-07-15-plan-first-and-iteration.md) |
+| 2026-07-15 | [WhatsApp session audit](done/2026-07-15-whatsapp-session-audit.md) |
 
 ## Conventions