fix(beads): Align bead descriptions with Phase B spec
Reconciled 9 beads (bd-20e, bd-dty, bd-2f2, bd-3as, bd-ypa, bd-32q,
bd-1nf, bd-2ez, bd-343o) against docs/phase-b-temporal-intelligence.md.
Key fixes:
- bd-20e: Add url field, align StateChanged to {state} per spec 3.3,
fix NoteEvidence fields (note_id, snippet, discussion_id), simplify
Merged to unit variant, align CrossReferenced to {target}
- bd-dty: Restructure expanded_entities JSON to use nested "via" object
per spec 3.5, add url/details fields to events, use "project" key
- bd-3as: Align event collection with updated TimelineEventType variants
- bd-ypa: Add via_from/via_reference_type/via_source_method provenance
- bd-32q, bd-1nf, bd-2f2: Add spec section references throughout
- bd-2ez: Document source_method value discrepancy (spec vs codebase)
- bd-343o: Add spec context for how it extends Gate 2
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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