refactor(parser): split relations.rs (2783 lines) into 9-module per-concern tree

[sdsrss]

Summary

• Splits src/parser/relations.rs (2783 lines) into src/parser/relations/{mod,helpers,imports,inherits,exports,routes,rust,dart,tests}.rs. Mirrors the per-domain split landed for queries.rs in refactor(storage): split queries.rs into 10-module per-domain tree #15.
• mod.rs (722 lines) keeps the giant walk_for_relations dispatch as one match — its arms share current_scope / current_class propagation, so splitting per-language would either duplicate recursion or lose scope context.
• Public surface unchanged: extract_relations, extract_relations_from_tree, ParsedRelation. pipeline.rs and tests/parser_deep_test.rs need no edits.

File	Lines	Concern
mod.rs	722	walker dispatcher + entry points
helpers.rs	75	extract_callee_name + string-literal subtree lookup
imports.rs	229	generic JS/TS/Java + Python import shapes
inherits.rs	231	extract_superclasses + extract_implements across class-style langs
exports.rs	61	TS/JS export statements
routes.rs	182	Express + Go + Python HTTP route registration
rust.rs	108	use declarations + impl Trait for Type
dart.rs	136	Dart imports + call expressions
tests.rs	1138	all #[cfg(test)] tests

Submodule items use pub(super); mod.rs re-imports what each walker arm needs.

Test plan

• cargo check — clean
• cargo +1.95.0 clippy --no-default-features -- -D warnings — clean
• cargo +1.95.0 clippy --all-targets -- -D warnings — clean
• cargo test --release — 415 tests, 0 failed (1 pre-existing #[ignore])
• CI green on PR

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 16b8929f-3232-4b9b-9249-084d820d3c2f

📥 Commits

Reviewing files that changed from the base of the PR and between 657a1f9 and d6dd207.

📒 Files selected for processing (10)

• src/parser/relations.rs
• src/parser/relations/dart.rs
• src/parser/relations/exports.rs
• src/parser/relations/helpers.rs
• src/parser/relations/imports.rs
• src/parser/relations/inherits.rs
• src/parser/relations/mod.rs
• src/parser/relations/routes.rs
• src/parser/relations/rust.rs
• src/parser/relations/tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/split-relations-rs

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