fix(pi): preserve overloaded entity targets and recover timed-out checks

[rs545837]

Changes

• Preserve parser-provided overload locations through edit generation and normalize them to explicit selectors.
• Restart disposable validation checkers after timeouts while retaining partial diagnostics and unknown validation status.
• Restart stopped checkers before subsequent checks.
• Add regression coverage for overload selection, stale locations, timeout recovery, and recovery failure.

Validation

12 focused Node tests and one Python test passed. No benchmark artifacts or task-specific patches included. No end-to-end speedup claim.

[inspect-review]

inspect review

Triage: 14 entities analyzed | 0 critical, 0 high, 5 medium, 9 low
Verdict: standard_review

Findings (0)

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Reviewed by inspect | Entity-level triage found 0 high-risk changes

[inspect-review]

inspect review

Triage: 14 entities analyzed | 0 critical, 0 high, 5 medium, 9 low
Verdict: standard_review

Findings (0)

---

Reviewed by inspect | Entity-level triage found 0 high-risk changes