Release FixMap v0.8.8: close the 46-issue backlog

[aryamthecodebreaker]

Summary

• fixes the complete 46-issue backlog for v0.8.8 across Core, CLI, MCP, GitHub Action, evaluation, release automation, documentation, and the production website
• adds exact Git-state scan caching, versioned report validation, precise scanner/verify diagnostics, and regression coverage for every issue
• updates all package/manifest versions to 0.8.8, refreshes checked-in evidence and generated assets, and hardens the publish workflow
• replaces the duplicated README with a focused 153-line entry point and upgrades the seven-route site for truthful generated output, metadata, responsive layout, AA contrast, keyboard focus, and persistent system-aware themes

Verification

• npm ci
• npm run ci (460 tests; typecheck, lint, builds, rendered-artifact drift, smoke, self evaluation, adversarial gate, 1,000-file benchmark)
• node scripts/evaluate-external.mjs --suite external --gate --check-recorded
• node scripts/evaluate-external.mjs --suite heldout --gate --check-recorded
• npm audit (0 vulnerabilities)
• core and CLI npm pack --dry-run
• browser smoke on all 7 routes in light/dark and 390px mobile; unique canonical/Open Graph metadata; 0 contrast failures
• issue-to-test matrix: docs/releases/v0.8.8-issue-verification.md

Issues

Closes #451
Closes #452
Closes #453
Closes #454
Closes #455
Closes #456
Closes #457
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Closes #495
Closes #496