feat(miner): add calibration backtest-eligibility for ContributionProfile replay

[andriypolanski]

Summary

• Closes miner: calibration backtest-eligibility — replay a candidate ContributionProfile against the captured exclusion corpus #8545
• New pure core packages/loopover-miner/lib/ams-eligibility-backtest.ts exporting backtestEligibilityCandidate(events, currentProfiles, candidateProfiles): reads the four eligibility ruleIds from signal_rule_fired / signal_human_override events, reconstructs FilterCandidate from bounded metadata (miner: capture bounded candidate context (labels/assignees/owner) in eligibility-exclusion fired-event metadata #8544), classifies via filterCandidatesByProfiles (no filter reimplementation), and scores with the same engine backtest helpers + min-rank sample floors as ams-calibration: backtest a proposed min-rank skip threshold against the node's own selection history #8184.
• New CLI subcommand calibration backtest-eligibility --profile <path> [--json] in calibration-cli.ts, mirroring runBacktestThreshold: under-floored corpus prints an explicit line and exits 0 without persisting; success prints skippedNoContext and renderBacktestComparison for visible + held-out splits; invalid/missing --profile → exit 1; operational errors → exit 2.
• Persists each completed run as ams_eligibility_backtest_run via recordAmsEligibilityBacktestRun; computeAmsBacktestTrackRecord now aggregates threshold + eligibility runs (parity with ams-calibration: aggregate backtest track record into the miner calibration report + snapshot event #8185). Main calibration report and calibration snapshot include eligibility runs in track-record attachment.

Scope

• The PR title follows type(scope): short summary Conventional Commit format, for example fix(api): restore profile access checks.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves (e.g. Closes #123) — a linked open issue is required for every contributor PR.

Validation

• git diff --check
• npm run actionlint
• npm run typecheck (via npm run build:miner)
• npm run build:miner
• npx vitest run test/unit/miner-ams-eligibility-backtest.test.ts test/unit/miner-calibration-cli.test.ts — 47 passed
• CI-scoped Codecov simulation: npx vitest run test/unit/miner-ams-eligibility-backtest.test.ts test/unit/miner-calibration-cli.test.ts --coverage.all=false --coverage && npx diff-cover coverage/lcov.info --compare-branch=origin/main — 100% patch lines (147/147) and 100% patch branches (188/188) on changed miner files
• npm run test:coverage (full unsharded gate)
• npm run test:ci
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

If any required check was skipped, explain why:

• Miner-only change (packages/loopover-miner/lib/**). Tests import .ts via variable specifiers (miner-ams-eligibility-backtest.test.ts, miner-calibration-cli.test.ts) so codecov/patch grades changed lines under --coverage.all=false. Full test:ci left to CI.

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests.
• API/OpenAPI/MCP behavior is updated and tested where needed.
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks.
• Visible UI changes include a UI Evidence section below with JPG/JPEG or PNG screenshots arranged as organized, captioned, clickable thumbnails. SVG screenshots are not used as review evidence. Review-only screenshots or recordings are not committed to the repository.
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs.

UI Evidence

Not applicable — miner calibration CLI advisory backtest only.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.47%. Comparing base (0c19927) to head (381c59e).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8571      +/-   ##
==========================================
- Coverage   89.58%   89.47%   -0.11%     
==========================================
  Files          97      100       +3     
  Lines       22706    23113     +407     
  Branches     3872     4017     +145     
==========================================
+ Hits        20341    20681     +340     
- Misses       2187     2224      +37     
- Partials      178      208      +30     

Flag	Coverage Δ
backend	83.53% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/loopover-miner/lib/ams-calibration.ts	51.93% <100.00%> (ø)
...ges/loopover-miner/lib/ams-eligibility-backtest.ts	100.00% <100.00%> (ø)
packages/loopover-miner/lib/calibration-cli.ts	97.51% <100.00%> (ø)

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