feat(sw-build,sw-ship): workDir paths, branch naming, unit advancement

[MacAttak]

Summary

• Updates sw-build/SKILL.md to use {currentWork.workDir}/ for unit-local artifacts and {currentWork.unitId} for branch naming in multi-unit mode
• Updates sw-ship/SKILL.md to use {currentWork.workDir}/ for spec and evidence paths
• Rewrites sw-ship unit advancement to find next planned unit, set building status, and reset gates/tasks

Acceptance Criteria

#	Criterion	Status
AC-1	sw-build inputs use {currentWork.workDir}/ for unit-local	PASS
AC-2	sw-build design.md uses design-level path	PASS
AC-3	Task loop uses {currentWork.workDir}/spec.md	PASS
AC-4	Parent context fallback note for build agents	PASS
AC-5	Branch uses unitId when set (multi-unit)	PASS
AC-6	Branch uses id when null (single-unit)	PASS
AC-7	sw-ship spec at {currentWork.workDir}/spec.md	PASS
AC-8	sw-ship evidence at {currentWork.workDir}/evidence/	PASS
AC-9	Finds next planned entry by order	PASS
AC-10	Sets unitId and workDir from next unit	PASS
AC-11	Sets status to building (not planning)	PASS
AC-12	Resets gates, tasksCompleted, tasksTotal, currentTask	PASS
AC-13	Handoff: "Next: {unit-name}. Run /sw-build."	PASS
AC-14	"All work units complete." when none remaining	PASS
AC-15	Single-unit backward compatibility preserved	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 — 15/15 criteria PASS with line-level mappings

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