docs(plan): add Plan 3 (Tier-1 primitives + DraggableBlock)
Eight components under apps/app/src/components-v2/shared/ plus a
severity-map utility, seeded from amended spec §8 and enforced via the
bidirectional Vitest consistency test required by §8.X.
Carries forward two Plan 2-deviation cleanup tasks from spec-amend
commit ae0bd2da:
- (a) migrate 6 centralized stories from src/stories/v2/ to co-located
- (b) refactor AppTopbar to wrap PrimeVue Menubar per RFC AD-3
Also deletes the X.vue boundary-test stub and repoints
boundaries-v2.spec.ts at a real shared component.
Plan format follows Plan 1 precedent (REQUIRED SUB-SKILL header,
- [ ] task syntax, Definition of Done, Plans 4-5 outline). Execution
will happen in a fresh Claude Code session via
superpowers:subagent-driven-development.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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