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feat(purge): support purging individual project directories (#135)

"lumen purge" is now all-or-nothing-or-selected: with no args it keeps
the existing full-wipe behavior; with one or more paths it removes only
those projects' indexes.

Matching uses project_path metadata stored inside each index DB (new),
not hash recomputation, so indexes created with custom or aliased model
names (e.g. LM Studio's "text-embedding-nomic-embed-code") still get
matched. The indexer records project_path alongside the existing
root_hash/embedding_model metadata. A new store.ReadMetaAt helper reads
metadata from a DB file read-only, without triggering schema migrations.

Paths are normalized via git root (or nearest ancestor index for non-git
trees), mirroring the resolution already used by "lumen index" and
"lumen search".

Indexes created by older binaries that did not record project_path
cannot be matched by path; the help text documents this and "lumen
purge" with no arguments remains the escape hatch.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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