Tom Boucher 616c1fa753 refactor: replace try/finally with beforeEach/afterEach + add CONTRIBUTING.md ...

Test suite modernization:
- Converted all try/finally cleanup patterns to beforeEach/afterEach hooks
  across 11 test files (core, copilot-install, config, workstream,
  milestone-summary, forensics, state, antigravity, profile-pipeline,
  workspace)
- Consolidated 40 inline mkdtempSync calls to use centralized helpers
- Added createTempDir() helper for bare temp directories
- Added optional prefix parameter to createTempProject/createTempGitProject
- Fixed config test HOME sandboxing (was reading global defaults.json)

New CONTRIBUTING.md:
- Test standards: hooks over try/finally, centralized helpers, HOME sandboxing
- Node 22/24 compatibility requirements with Node 26 forward-compat
- Code style, PR guidelines, security practices
- File structure overview

All 1382 tests pass, 0 failures.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-24 15:45:39 -04:00

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