refactor(web): delete dead code (R2) — 1736 lines removed

Tool-renderer registry (21 files, ~1.5k lines):
- src/lib/tool-renderers.ts — registry + getToolRenderer (exported, never
  imported anywhere)
- src/lib/renderers/index.ts + 10 .ts registrars + 10 .svelte components
- main.ts: removed the requestAnimationFrame(() => import('./lib/renderers'))
  that was the only thing keeping the dead subsystem alive

Dead components (never imported):
- ToolCallGroup, PlanProgress, GoalHeader, InlineApproval, SessionDigest

Dead store exports (written, never read):
- context.ts: pendingApprovals writable (+ Approval type import)
- events.ts: connectionState writable (+ its .set() calls)

Dead API surface:
- api.ts: SessionDigest interface + fetchSessionDigest (only caller was the
  dead SessionDigest.svelte)

Dead npm deps:
- mode-watcher (0 imports; superseded by stores/theme.svelte.ts)
- @internationalized/date (0 imports)

Also: fix stale comments referencing deleted symbols, update plan R1/R2
status. Build clean (4683 modules, down from 4706; one Svelte 5 warning
gone — the dead HealthSummary.svelte was emitting state_referenced_locally).

plans/2026-07-17-codebase-review-and-cleanup.md

@@ -397,8 +397,8 @@ behavior; tracked as R6.
 
 | ID | Action | Effort | Risk |
 | -- | ------ | ------ | ---- |
-| R1 | Delete dead Go: `notifier.VerifyApprovalToken`, `httpapi/stubs.go`; unexport 4 `checkdefaults` symbols | S | Low |
-| R2 | Delete dead web: 21-file tool-renderer registry, 5 dead components, 2 dead store exports, 2 dead npm deps | S | Low |
+| R1 | Delete dead Go: `notifier.VerifyApprovalToken`, `httpapi/stubs.go`; unexport 4 `checkdefaults` symbols | S | Low | ✅ done (c3973e7) |
+| R2 | Delete dead web: 21-file tool-renderer registry, 5 dead components, 2 dead store exports, 2 dead npm deps | S | Low | ✅ done (c3973e7+1) |
 | R3 | Decide sqlc vs raw SQL: delete 17 dead queries OR migrate inline SQL to use them | M | Medium |
 | R4 | Split `phase3.go` (2627 lines) into per-resource files; refactor `newServer` (708 lines) to a tool registry | M | Medium |
 | R5 | Rewrite `.agents/domains/knowledge/schema.md` + `.agents/shared/llm-wiki.md` for the DB-native model; delete/deprecate root `inventory.yaml` | M | Low |