Closes the FTS5 hyphen-tokenization asymmetry: `bi-polar is rare?`
retrieved only the Bi-Polar album/disambiguation cluster while the
medical-condition cluster (Bipolar disorder, Bipolar I/II disorder,
etc.) sat in the same shards untouched. `unicode61` splits hyphens
at index AND query time; `Bi-Polar Blues` indexes as [bi, polar, ...]
while `Bipolar disorder` indexes as [bipolar] — non-overlapping
token sets that never met.
Fix is query-layer only — no canonicalization_version bump, no
re-index, existing cache_keys stay valid:
- _hyphen_fold_variants(s): emit joined-no-hyphen variants for
every hyphenated run.
- _title_query_tokens(s): additively merges variants symmetrically
(queries AND titles when called on either).
- _filter_by_title_relevance: accept-path 5 — title stem-overlap
with hyphen-fold anchors passes the breadth gate. Rescues
`Bipolar disorder` (1-of-N qtoken match) without disrupting
non-hyphen queries (anchors empty → zero side effect).
- DEFAULT_QUERY_POLICY / DEFAULT_POLICY: hyphen_fold_v1: True
marker folds into governance_policy_hash; new records
cache-split cleanly from pre-fold records.
Live verification on /home/fox/.aborist/shards: same query now
retrieves `Bipolar disorder` (#5) and `Bipolar` disambiguation
(#7); model cites both, answer reads "Bi-polar disorder is not
rare; it affects approximately 2.8% of the U.S. population".
EVIDENCE-WARRANTED 2/2, properly grounded.
Tests: 4 new (3 unit, 1 integration with regression-pinned
Bipolar-disorder retrieval). Full suite 760 passed, 34 skipped.
Also: CLAUDE.md gains a close-when-complete hint for tickets — an
open ticket whose code already shipped is a stale map.
russell@unturf.com
8fb1fe51d7