docs(planning): write an accurate session handoff into STATE.md

[dknauss]

Prep before clearing context. Session Continuity was badly stale — it still read "Last session 2026-08-02, stopped at Phase 21 context gathered", which predates Phase 21 executing, v1.5.0 shipping, Phase 25, the correctness fixes, and the planning of Phases 27 and 28.

Clearing against that would have lost real continuity — the exact thing this section exists to prevent.

Rewritten as a START HERE a fresh session can act on

• v1.5.0 is live, but main carries unreleased work (Phase 25 + the three Phase 20 correctness fixes). A v1.5.1 patch clears the decks before new phases land on top. This is the single most important fact and was not recorded anywhere a resuming session would look.
• Phases 27 and 28 are planned and unblocked, with a recommended order and the reasoning — 28 is lighter, its 28-01 ships value alone, and it proves the shared modal shell with a scalar before 27 puts CRUD in one.
• Both 2026-08-10 decisions are named with their files, flagged read-before-reopening: the settings surface, and the fold story — including that the fold-versus-width "conflict" was mis-framed and withdrawn, so nobody re-derives a constraint that doesn't exist.
• The three carried caveats are restated, not left only in the milestone entry: fix: address ultrareview findings — collapse the per-user authorization path #128 shipped unreviewed, no human screen-reader pass, 21-05's checkpoint accepted on automated evidence.
• The wp-env port gotcha, including that Playwright reads WP_ENV_TESTS_PORT independently, and that the other project's containers are not ours to stop.

Also updates stopped_at and last_updated, both of which still described the state immediately after the v1.5.0 release.

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