feat(skills): add reusable UX improvement workflow (#1845)

Capture task-grounded research, preserved evidence, wireframes before graphical
concepts and independent assessments with separate author/evaluator contexts.
Document frozen-method reuse, scoped feedback, null/zero arithmetic, coverage
and stopping rules without requiring a particular model, harness or subscription.

Personally authored by a scoped Codex agent. Fresh independent source and
forward-use review APPROVE; 14 package-focused checks pass. Retain the synthetic,
single-model limits and separate installation/activation authority.

Package manifest: b93d7836ed7c70db62386192d6e1db5c4f867f841aaa7645c3c861def5a9b140

docs/SESSIONS.md

@@ -2058,3 +2058,9 @@ are never rewritten or removed; corrections are new entries.
 
 2026-11-04 — T3 MVP 3 independent lead — #797/#1839 R1 bounded-recovery correction and frozen replacement verification — source repair4/4GREEN; fresh R2/full-package gates pending, no commit/integration/live authority used.
 2026-11-04 | Mos, root integrator | #797 / Gitea #1839 | Applied exact R2 non-log source, unioned append-only histories, verified all12 file hashes and8 JS syntax/whitespace checks. Independent R2 APPROVE and4333 matching local cases retained; initial author Terra and lead-correction Sol attribution preserved. Native Git lineage refusal recorded; no transport bypass, publication or live action.
+2026-11-04 | Mos, root delivery coordinator | #797 / #818 | Committed reviewed exact MVP source locally asbd8120318 after4333 required local cases and R2 approval; source12/operational/schema checks match. Publication blocked by native helper anonymous-credential-refused, distinct from working Mos API access. Skill candidate02 verified and fresh independent review prepared. No bypass, push, installation, activation or live action.
+
+2026-11-05 | codex-ux-skill-author | Vikunja #818 UX improvement skill, chartered isolated checkout | Started baseline behavioral evidence; author-only handoff, independent source review pending; no protected actions.
+
+2026-11-05 | codex-ux-skill-author | Vikunja #818 UX improvement skill author handoff | Candidate-02 three-file package personally authored; package/copy/patch/arithmetic/integrity checks passed; 19 synthetic behavioral samples and all 186 raw artifacts retained with candidate-01 issue/correction and limits. Exact manifest b93d7836ed7c70db62386192d6e1db5c4f867f841aaa7645c3c861def5a9b140; evidence /mnt/storage/scratch/mosaic-lead/skill-ux-improvement/author/run-20261105T022125Z/HANDOFF.md. Independent source review pending; no commit, app suites, forge/queue writes, installation, activation or publication.
+2026-11-04 | Mos, skill integrator | #818 / Gitea #1845 | Integrated exact independently approved ms-ux-improvement candidate02 into source;3hashes/validator/whitespace pass and author histories preserved. Separate commit from MVP; its activation target staysbd8120318. No install, activation, publication or live action.