Many nodes sharing one generic label (framework route handlers all
labelled GET/POST, a repeated handler) consumed every BFS seed slot, so
query traversal explored near-identical neighborhoods and buried the
actual target. Seed selection now dedups by normalized label (GET/Get/get
collapse together), keeping one representative per label, and the per-term
guarantee loop honors the same cap so it can't reintroduce a dupe.
Adopts @devcool20's seed-dedup from #1832 but drops that PR's second
mechanism — a per-label multiplicity penalty applied inside the shared
_score_nodes. That scorer also resolves shortest_path/explain endpoints,
so dividing scores there silently reweighted path/explain (out of scope
for #1766 and able to flip endpoint selection); the dedup alone bounds
the flood. Also normalizes the dedup key (the PR keyed on the raw label).
Adds the tests the PR was missing: dedup of homonymous labels,
case/diacritic normalization, per-term-guarantee cap, and a guard that
identical-label nodes still score equally in _score_nodes.
Co-Authored-By: devcool20 <devcool20@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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