feat(sw-plan): rewrite for per-unit specs with individual review

[MacAttak]

Summary

• Rewrites skills/sw-plan/SKILL.md so each work unit gets its own directory with independent spec.md, plan.md, and context.md
• Adds per-unit spec loop with individual user approval via AskUserQuestion before moving to the next unit
• Preserves single-unit flat layout for backward compatibility

Acceptance Criteria

#	Criterion	Status
AC-1	Multi-unit outputs in units/{unit-id}/ directory	PASS
AC-2	No spec/plan at work root for multi-unit	PASS
AC-3	Single-unit flat layout preserved	PASS
AC-4	workUnits populated at pending before loop	PASS
AC-5	Single-unit decomposition uses flat layout	PASS
AC-6	User approves decomposition before directories created	PASS
AC-7	Per-unit directory with context, plan, spec	PASS
AC-8	Individual AskUserQuestion approval per unit	PASS
AC-9	Revision loop until approved	PASS
AC-10	Unit status → planned after approval	PASS
AC-11	designing → planning at start	PASS
AC-12	planning → building with unitId/workDir activation	PASS
AC-13	Gates reset on first unit activation	PASS
AC-14	Curated context subset per unit	PASS
AC-15	Self-contained unit context	PASS
AC-16	Compaction recovery with skip/resume	PASS
AC-17	Decomposition revision requires reset	PASS
AC-18	No implementation code in stage boundary	PASS
AC-19	Handoff to /sw-build after activation	PASS

Gate Results

Gate	Status	Findings (B/W/I)
spec	PASS	0/0/0
build	SKIP	N/A (markdown-only)
tests	SKIP	N/A (markdown-only)
security	SKIP	N/A (markdown-only)
wiring	SKIP	N/A (markdown-only)

Evidence

• Spec Compliance — 19/19 criteria PASS with line-level mappings

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