chore: Sweep dead code from the package-split refactor

[charlesvien]

Problem

The big package-split refactor left a ton of dead code lying around, it pollutes agent context on every read. This is a knip + ts-morph dynamic-harness sweep to clear it out.

Changes

1. Deleted ~340 dead exported declarations (values + types) across 13 packages
2. Removed dead files and orphaned types; collapsed redundant export aliases
3. Removed unused deps/devDeps and declared 12 previously-undeclared (hoisted) deps
4. Fixed knip blind spots: dist-resolution false positives, un-ignored apps/web, protected native deps
5. Net: 125 files, +109 / −3,503 lines

How did you test this?

All run locally on this branch:

• pnpm typecheck — green across all 22 workspaces (incl. apps/web, the cross-package gate)
• pnpm lint (biome) — clean
• pnpm build — green (8/8, incl. the Electron package)
• pnpm test — green (18/18 packages; workspace-server DB tests pass after rebuilding better-sqlite3 for the Node 26 ABI)
• Every package was committed behind its own typecheck/test gate. A knip → ts-morph harness with an external-usage guard ensured only genuinely 0-reference symbols were deleted; spot-checked that the remaining knip flags are live over-exports / dist false-positives, not dead code.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

[github-actions]

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_{Reviewed by React Doctor for commit 0877f5d.}

[stamphog]

Too much faff.