auto-maintenance: merge Two-Weeks-Team/PreviewForgeForClaudeCode PR #122 #221

Job	Run time
Test hooks (unit)	15s
Verify plugin structure (ubuntu-latest)	17s
Agent inventory (144 target)	4s
Verify plugin structure (macos-14)	19s
Template build smoke (B1+B2 regression guard)	21s
Shell script lint	12s
	1m 28s

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