fix: Dart dependency graphs and cross-language caller isolation

[rs545837]

Summary

Fixes #491.

• Resolve real Dart call expressions, declaration scopes, constructor-bound locals and typed parameters, including new/const construction.
• Filter typed/static member candidates by language family; prefer imported/local class owners. Preserve JS/TS interoperability.
• Invalidate persisted graph/query caches so upgrades do not retain the old edges.
• Add eight core regression tests and cold/warm CLI callers/refs coverage. Replace the old test that expected zero Dart call edges.

Validation

• Local core/CLI unit and integration suites: 1,115 passing tests across 44 suites.
• Final Dart fixture rerun: all eight tests pass.
• Core doc-test target passes (zero doctests).
• Tests ran with GIT_CONFIG_GLOBAL=/dev/null and GIT_CONFIG_NOSYSTEM=1 to prevent the locally configured external Git diff wrapper from corrupting patch-input fixtures. No machine settings changed.
• CI is pending; merge is gated on the latest head and passing checks.

Boundaries

This fixes the reported extraction and mixed-language collision bugs, not complete Dart semantic resolution. Dart import aliases, package URIs, dynamic dispatch and incremental resolution reuse require separate work. Dart remains conservatively ineligible for incremental edge reuse.

[inspect-review]

inspect review

Triage: 25 entities analyzed | 0 critical, 0 high, 9 medium, 16 low
Verdict: standard_review

Findings (0)

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

[rs545837]

Temporarily reopening to refresh a stale PR head: the branch points to 1a9686a, while the PR ref is still f5da7ed. The latest commits include the required changelog entry and a fixture correction. No merge until checks cover the current head.

[inspect-review]

inspect review

Triage: 25 entities analyzed | 0 critical, 0 high, 9 medium, 16 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: 25 entities analyzed | 0 critical, 0 high, 9 medium, 16 low
Verdict: standard_review

Findings (0)

---

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

[rs545837]

Refreshing the stale PR head after the final explicit-this regression fix. Final local validation: 1,115 core/CLI tests pass, including eight focused core regressions and cold/warm CLI coverage. The branch is now 2c427f2; CI must evaluate that head.

[inspect-review]

inspect review

Triage: 26 entities analyzed | 0 critical, 0 high, 9 medium, 17 low
Verdict: standard_review

Findings (0)

---

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

[inspect-review]

inspect review

Triage: 26 entities analyzed | 0 critical, 0 high, 9 medium, 17 low
Verdict: standard_review

Findings (0)

---

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