feat(index): parallelize full index build#3
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…d FTS rebuild)
build_full now parses files across a forkserver process Pool (CPU/GIL-bound symbol extraction) feeding a single bulk-load writer: FTS triggers dropped during load, batched executemany with periodic commits (bounds the WAL), one symbols_fts('rebuild'), then triggers recreated. Serial and parallel share the same writer, so output is identical by construction.
Adds index_build_workers and index_build_batch_size config and flips index_huge_repo_async_init default to synchronous; threads workers/batch through init/execute/plan/resume. Adds the missing __main__ 'build-full' entry (the async build path was previously a silent no-op).
Verified byte-identical files/symbols/symbols_fts/files_fts vs the serial path on a 358k-file repo; ~132x faster (45s vs ~99min).
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Summary
Test Plan
test_state_file_index_parallel.py, 347 lines)test_cli_init_with_index.py)