feat(mcp): parse validation command summaries

[oktofeesh1]

Summary

• parse structured local validation summaries for branch analysis
• preserve status, duration, and bounded summary fields
• treat focused/passed checks as validation evidence without sending raw logs

What changed

• expands local validation status handling for passed, failed, skipped, focused, and unknown commands
• sanitizes and truncates CLI validation summaries before API payloads
• updates API/MCP schemas and PR packet rendering for duration metadata
• keeps readiness integration fixtures current so freshness SLO assertions remain deterministic in CI

Why

• local branch preflight should understand validation evidence even when no test files changed, while keeping logs and source content out of payloads.

Validation

• git diff --check
• npx tsc --noEmit
• npx vitest run test/unit/local-branch.test.ts test/unit/mcp-cli.test.ts
• npm run test:coverage
• GitHub validate, Contributor trust, and Superagent Security Scan pass on the latest head

Closes #101

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[JSONbored]

@oktofeesh1 this is merge-ready from my pass.

• Deterministic: check rollup is green and merge-tree against current origin/main is clean.
• Maintainer judgment: validation summary parsing now covers skipped/focused/unknown cases, exit codes, durations, and path redaction.
• Validation: API/MCP/OpenAPI surfaces and parser tests were updated together.