indexing_trigger_auto

Summary

When the editor host is idle, run a * * background staleness check * * — not a reindex and not a soft full sync UI pass.
Philosophy: computationally cheap. Load document mtimes in * * one * * SQLite read, compare each file's FS mtime in memory, and only then index mismatched or new files; drop deleted docs in one batched delete.
A single MAX ( mtime ) watermark is not sufficient ( one file can get newer while another gets older ).
If nothing is stale: no state transition, no progress UI, no parse.
If some files are stale: index * * only those files * * under nonblocking_index.
Schedule after a quiet period with no index activity; prefer running when the window is unfocused; defer or cancel if the user becomes active again.
Extension host only ( index-service.ts ); CLI / MCP have no idle loop ( they sync on activate / command ).

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