A path query like `explain "app/api/route.ts"` tokenized to terms that matched no
node, so explain/affected returned "No node matching". Source-file paths are now
part of the search index and matched exactly (serve._find_node gains a leading
source-exact tier; affected.resolve_seed gains a source-file match). When several
nodes share a source_file (e.g. a file-level node plus a function node), the lookup
prefers the file-level node — the L1 node whose label basename matches the queried
filename, falling back to the unique L1 or unique basename match, else None.
Ported from PR #1503 by @behavio1. Maintainer fixes on top: aligned trailing-
separator handling between resolve_seed and _find_node (affected previously
returned None for a trailing-slash path that explain resolved), corrected the
stale "three-tier" _find_node docstring, and added regression tests for the
trailing-slash parity and the ambiguous-no-file-node -> None case.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
behavio1