indexer: extend edge capture to JS, TS, TSX, Go, Java, Rust

[IceRhymers]

Part of #82. Depends on #84 (the Python pattern must be proven first).

Summary

Extend edge capture to the remaining supported languages: JavaScript, TypeScript, TSX, Go, Java, Rust.

Scope

• Per-grammar edge node-map entries (call expressions, import/require/use declarations differ per grammar) in indexer/languages.py.
• Per-language fixtures for calls, method calls, and imports, mirroring the symbol fixtures.
• A parity test asserting every language in SYMBOL_KINDS also has an edge node map (so a future language can't silently ship without edges).
• One additional INDEX_SEMANTICS_VERSION bump if landing after the Python batch (or none if batched together).

Acceptance criteria

• All 7 languages emit typed call/import edges with enclosing-symbol attribution.
• Parity test guards SYMBOL_KINDS/edge-map coverage.
• Fixtures cover each grammar's call and import shapes.

[IceRhymers]

Completed via child PR #92, squash-merged into the #82 integration branch (integration/knowledge-graph-reference-edges). The umbrella draft PR #89 remains open until the complete epic is integrated and human-reviewed into protected master.