Add Windows Pitot agent E2E coverage

[bigboateng]

Summary

• run every Pitot coding-agent E2E workflow on Windows alongside Ubuntu and macOS
• require Windows artifacts in the trusted sticky PR report before an agent is marked passing
• make Python setup, Claude discovery, Cursor fallback, and compiled hook paths portable to Windows
• bind the workflow matrix, result producer, and reporter platform sets with regression tests

Why

PR #102 surfaced per-agent status but implemented only Ubuntu and macOS. Its separate Windows runtime check did not exercise each coding-agent integration, leaving the PR report incomplete for Windows visibility.

Developer impact

Pitot PRs now show Ubuntu, macOS, and Windows evidence for Claude, Cursor, Codex, Gemini, and OpenCode. Cursor uses the existing active-hook subprocess verification on Windows because its installer path is not available there; other hosts retain real CLI verification where supported.

Validation

• python3 -m unittest discover -s labs/15-pitot/tests -p "test_*.py" (21 tests)
• go test ./... from labs/15-pitot/pitot
• python3 labs/15-pitot/scripts/build_pitot.py --repo . --check
• bash -n labs/15-pitot/tests/e2e_unified_runner.sh
• simulated Windows executable naming/path hook run with Gemini
• git diff --check

Remaining verification

The new GitHub Actions Windows matrix is the authoritative Windows-host validation for all five agents.

[bigboateng]

Pitot coding-agent E2E — manual bootstrap report

PR #104 changes the trusted workflow_run reporter itself, which GitHub executes from the default branch. This manual report records the commit-bound checks produced by the PR branch; after merge, future Pitot PRs will use the repaired automatic reporter.

Agent	Ubuntu	macOS	Windows	Result
Claude	✅ Pass	✅ Pass	✅ Pass	✅ Passing
Codex	✅ Pass	✅ Pass	✅ Pass	✅ Passing
Cursor	✅ Pass	✅ Pass	✅ Pass	✅ Passing
Gemini	✅ Pass	✅ Pass	✅ Pass	✅ Passing
OpenCode	✅ Pass	✅ Pass	✅ Pass	✅ Passing

Source commit: 980600ac