refactor(indexer): split pipeline.rs (2374 lines) into 7-module per-concern tree

[sdsrss]

Summary

• Splits src/indexer/pipeline.rs (2374 lines) into src/indexer/pipeline/{mod,embed,context,python_modules,resolve,index_files,tests}.rs. Completes the 三巨头 split started with refactor(storage): split queries.rs into 10-module per-domain tree #15 (queries.rs) and refactor(parser): split relations.rs (2783 lines) into 9-module per-concern tree #16 (relations.rs).
• mod.rs (237 lines) keeps public entry points + structs + glue. The Phase-0..3 orchestrator stays whole in index_files.rs (827 lines) — its phases share local transaction/atomics/batch_parsed/name_to_ids state that splitting would have to thread back via large arg lists.

File	Lines	Concern
mod.rs	237	entry points + IndexStats/IndexResult/ProgressFn + collect_dirty_node_ids
embed.rs	71	embed_and_store_batch + sequential fallback path
context.rs	197	categorize_edges + format_route_from_metadata + regenerate_context_strings + repair_null_context_strings
python_modules.rs	73	build_python_module_map + resolve_python_module_targets
resolve.rs	204	refine_ambiguous_targets + resolve_pending_calls
index_files.rs	827	Phase 0..3 orchestrator + FileIndexed
tests.rs	884	all #[cfg(test)] tests

Public surface preserved (crate::indexer::pipeline::{run_full_index, ensure_file_indexed, run_incremental_index, run_incremental_index_cached, embed_and_store_batch, repair_null_context_strings, IndexStats, IndexResult, ProgressFn}). External callers in cli.rs / mcp/server / tests/ / benches/ need no edits.

Submodule items use pub(super); embed_and_store_batch and repair_null_context_strings get pub use'd at mod.rs to keep their existing public path.

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 — 292 lib + 129 integration = 421 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: 4bc9aad1-c2b7-4734-9673-994c46f113f5

📥 Commits

Reviewing files that changed from the base of the PR and between 2dfbab9 and 968f63b.

📒 Files selected for processing (8)

• src/indexer/pipeline.rs
• src/indexer/pipeline/context.rs
• src/indexer/pipeline/embed.rs
• src/indexer/pipeline/index_files.rs
• src/indexer/pipeline/mod.rs
• src/indexer/pipeline/python_modules.rs
• src/indexer/pipeline/resolve.rs
• src/indexer/pipeline/tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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