chore(release): bump version to 0.6.6 - #1670

0.6.5 → 0.6.6:

• Relationship writes seek instead of scan on Neo4j: (name, path) composite indexes for all 11 positional labels — up to 485× on large graphs (perf(schema): index (name, path) so relationship writes seek, not scan #1653, @mollyjester)
• Rust module-scoped and Type::method() CALLS now land end-to-end: the label-aware called-context clause is wired in (fix(writer): wire the label-aware called-context clause (#1510) #1667/bug(indexer): _called_context_clause is never called, so Rust module-scoped CALLS edges are silently dropped at write time #1510) and the full scoped-resolution chain is pinned by regression test (test(resolution): pin Rust Type::method() resolution end-to-end (#1658) #1668/bug(resolution): Rust Type::method() calls never produce a CALLS edge — scoped-call receiver is not consumed #1658)
• README star-history chart replaced with a link while the upstream API is restricted (docs: link out to star-history while the chart API is restricted #1666); broken docs reference removed (docs: remove broken .cursor plan file reference from CGC_E2E_BUG_REPORT.md #1663)
• Complexity-CI test fixture made diagnosable under load (test(ci): diagnosable failures for the complexity-CI fixture #1669)

Full integration suite green at the release commit: 89 passed / 0 failed.