test(windows): establish support baseline

[liugddx]

Summary

• document the native Windows 11 x64 development baseline and current support boundary
• inventory and classify all 65 test declarations currently excluded on Windows
• add repeatable CLI and real Electron startup smoke coverage
• fix Windows path, permission, Git long-path, and Electron process-tree issues found while establishing the baseline

Part of #2142.

Baseline results

• workspace build: pass
• repository script tests: 110 pass, 0 fail, 1 macOS-only skip
• managed workspace baseline: 17 pass, 0 fail, 5 skip
• Windows CLI and Electron startup smoke: pass, with no residual Electron processes
• storage suite: 514 pass, 100 fail, 40 skip; failures are dominated by SQLite cleanup EBUSY
• complete npm test: does not exit within 10 minutes and leaves the workspace runner alive

The failing storage and root-runner results are recorded diagnostic baselines for the next phase, not claims of full Windows support.

Validation

• npm run windows:inventory
• npm run test:scripts
• node scripts/windows-smoke.mjs
• Biome checks for all changed source files
• git diff --check

[liugddx]

Re-reviewed at 7c9271b7.

The earlier blocking inventory gap is resolved:

• findSkipExpressions() now scans across line boundaries instead of requiring skip: and process.platform on the same source line.
• regression coverage includes both a multiline ternary and a multiline logical expression;
• the seven previously omitted declarations are now present in the generated inventory;
• the documented total is corrected from 59 to 66;
• windows:inventory --check remains a deterministic drift gate.

I also rechecked the surrounding Phase 0 changes: the Windows smoke remains isolated, uses the real Electron startup path, waits for the main-process readiness marker, and tears down the process tree; core.longpaths=true is scoped to Maka-owned Git invocations; POSIX mode/probe assertions are skipped only where Windows cannot represent the same contract.

All current CI checks pass and the PR is mergeable. I found no remaining blocking issue in this revision.