chore(beads): close wkc6 as resolved, split remainder to ubdxf

[Sinity]

Summary

Investigation bead polylogue-wkc6 (census-plan bookkeeping at 89% of source.db, growing ~1GB/day) is closed: its urgent retention ask already shipped in a prior session and is verified holding live. Remaining architectural items split into a new bead so they aren't lost.

Problem

wkc6 overlapped in scope with the in-flight raw-authority redesign (polylogue-lb39z Phase 1, polylogue-w6hql Phase 2), so it needed investigation to determine whether it was fully covered by that track or needed its own action.

Solution

No source code changed. Verified live against /realm/db/polylogue that PR #3390 (wires prune_raw_authority_census_history into the census-record path) and PR #3530 (_delete_orphaned_raw_authority_plans) already landed and are holding: raw_authority_census_plans/_post_plans steady at 761,602 rows each (down from 6,621,562/6,621,527 measured 2026-07-29), source.db shrunk 6.6GB -> 1.48GB, PRAGMA freelist_count=0.

Closed wkc6 with that evidence. Its two remaining architectural DO items (stop recording carried_forward rows at all; decide durable vs disposable tier placement) are real but non-urgent, and distinct from w6hql's "collapse the verdict vocabulary to one closed enum" scope -- split into polylogue-ubdxf and cross-referenced on w6hql's notes.

Verification

• bd show polylogue-wkc6 --json / bd show polylogue-ubdxf --json / bd show polylogue-w6hql --json reflect the new state.
• Live query against /realm/db/polylogue/source.db (read-only): census/plan/post-plan row counts and file size as stated above.
• gh pr view 3390/3530 --json state,mergedAt confirm both MERGED.

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