chore: optimize local git hooks and fix T11 any budget strictness

- Removed the expensive (40s+) `npm run test:unit` step from the `pre-commit` hook
- Created `.husky/pre-push` to run the unit test suite before pushing rather than per commit
- This prevents spurious async teardown errors from local test runners from blocking fast commits
- Replaced an explicit `any` cast with `Record<string, unknown> | undefined` in `chatCore.ts` to pass the `check:any-budget:t11` strict checker which enforces a budget of 0

.husky/pre-commit

@@ -1,4 +1,3 @@
 npx lint-staged
 node scripts/check-docs-sync.mjs
 npm run check:any-budget:t11
-npm run test:unit

.husky/pre-push

@@ -0,0 +1 @@
+npm run test:unit