indexer: make sure prune-branch only deletes the branch and not more

reposerver: support branch patterns

fix duplicate snippets and newline counts

Fixrelease (#4)

add better indexes for symbol rank

definition boost for sorting. I think it's higher quality search results

regex: more aggressively limit regex searches

THey are heavy and if they are wide, they take a really long time.

Note this limitation in the mcp instructions too.

better mcp guidance

don't inject <mark> in db, db returns spans

make mcp server compatible with claude