fix(engine): use aggregate repo-stat issues for cache-only outcome totals

[JSONbored]

Motivation

• Fix a correctness regression where cache-only contributor totals dropped aggregate ContributorRepoStatRecord.issues when detailed IssueRecord rows were absent or truncated, causing history totals to undercount compared to profile/reconciliation cached totals.

Description

• Update src/signals/engine.ts to compute openIssueRows, closedIssueRows, and cachedIssueCount = Math.max(cachedIssues.length, cachedStat?.issues ?? 0) and to use cachedIssueCount as a fallback when official issue counts are absent.
• Ensure openIssues falls back to openIssueRows and closedIssues falls back to Math.max(closedIssueRows, cachedIssueCount - openIssueRows, 0) so issues = openIssues + closedIssues preserves aggregate repo-stat counts.
• Add a unit test in test/unit/signals-v2.test.ts that constructs a cache-only contributor with repoStats.issues = 7 and no IssueRecord rows and asserts profile, repo outcome, history totals, and reconciliation all reflect the aggregate issue count.
• Maintain existing behavior that official Gittensor totals remain authoritative when present.

Testing

• Ran npx vitest run test/unit/signals-v2.test.ts and the test file passed (all tests succeeded).
• Ran npm run typecheck (tsc --noEmit) and it completed successfully.

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Codex Task

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	gittensory-ui	d0e4536	Commit Preview URL Branch Preview URL	Jun 10 2026, 08:24 AM

[superagent-security]

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

[gittensory]

Note

Gittensory Gate skipped

PR closed before full evaluation. No late first comment was created.

Signal	Result	Evidence	Action
Gate result	⚠️ Skipped	#511 is no longer open.	No action.

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