fix(issues): prevent self-solved issue discovery credit

[JSONbored]

Motivation

• Fix an integrity bug in the cached fallback for issue-discovery counts where a contributor's own merged PRs could be treated as valid_solved evidence, inflating private outcome totals and downstream scoring when official Gittensor data is absent.

Description

• Change lifecycle classification to detect when all linked merged solver PRs are authored by the issue reporter and mark those cases as solved (not valid_solved) for issue_discovery/split lanes by adding mergedSolverPrs, issueAuthorLogin, and selfSolvedLoop checks in classifyIssueDiscoveryLifecycle in src/signals/engine.ts.
• Update the cached fallback comment in cachedSolvedIssueCounts to clarify that merged-PR evidence still grants solved credit but does not inflate valid issue-discovery credit for self-solved loops.
• Add a unit test (test/unit/signals-v2.test.ts) that asserts a self-authored issue/merged-PR pair is classified as solved (not valid_solved) and update expectations for contributor outcome history, reconciliation, and strengths accordingly.

Testing

• Ran git diff --check with no issues found.
• Ran npm run typecheck which completed successfully.
• Ran npx vitest run test/unit/signals-v2.test.ts and all tests passed (30 passed).
• Ran the focused test npx vitest run test/unit/signals-v2.test.ts -t "derives solved and valid-solved" which also passed.

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Codex Task

[ghost]

Note

Gittensory Gate skipped

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

Signal	Result	Evidence	Action
Gate result	⚠️ Skipped	#504 is no longer open.	No action.

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Checked by Gittensory, a quiet PR intelligence layer for OSS maintainers.

[superagent-security]

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

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