Pay down pre-existing error→warn lint debt. Removes dead imports/vars, unused functions, redundant regex/string escapes, and stale eslint-disable directives; converts unused `catch (_e)` to optional catch binding (src/*.cts).
No behavior change. Lint 345→125 warnings (0 errors); deferred categories (n/no-process-exit, test-sleeps, control-regex) tracked in #732 for follow-up. Full test suite green (0 failures); code-review verified all removals unused and all escape fixes semantics-preserving.
Closes#732
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Six failing tests covering all Done-when criteria from #3523:
1. No warning emitted for top-level branching_strategy
2. Value still surfaced via git.branching_strategy after loadConfig
3. Double-emission capped to single-emission per process
4-5. On-disk migration (option 3): write-back + no-clobber guard
6. CJS↔SDK contract: both agree on legacy-shape fixture
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
