feat(mcp): expose index freshness and relationship provenance #110

Job	Run time
security / codeql-gate	44m 40s
lint / lint	4m 42s
security / security-static	31s
security / license-gate	3m 6s
test / test-windows	28m 2s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	54m 20s
test / test-unix (macos-15-intel, cc, c++)	19m 12s
test / test-unix (macos-14, cc, c++)	13m 12s
test / test-unix (ubuntu-latest, gcc, g++)	11m 7s
ci-ok	9s
	2h 59m 1s

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