A nested git repo tracked as a gitlink (mode 160000) — a clone `git add`ed
into the super-repo without a `.gitmodules` entry, or a submodule that
isn't active/initialized in this checkout — fell through both file-collection
passes: it's tracked, so the untracked `-o` listing skips it, but it's not
an active submodule, so `--recurse-submodules` won't expand it. Indexing the
top level therefore pulled in only the outer repo's own files and stopped at
the nested repo's boundary (one report: ~10 files at the root).
Switch the tracked scan to `ls-files -s` to expose file modes, collect the
unexpanded 160000 entries, and recurse into each that has a real working tree
on disk as its own embedded repo. Mirror the same discovery in
discoverEmbeddedRepoRoots so the watcher's scope stays equal to the indexer's.
Active submodules (#147) and untracked nested clones (#193) are unchanged;
gitlinks under default-ignored dirs (vendor/, node_modules/) stay excluded
(#407); an uninitialized submodule with no checkout on disk is left alone.
Adds four-shape coverage in extraction.test.ts.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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