auto-maintenance: merge Two-Weeks-Team/PreviewForgeForClaudeCode PR #124 #225

Job	Run time
Verify plugin structure (ubuntu-latest)	15s
Test hooks (unit)	13s
Agent inventory (144 target)	5s
Shell script lint	11s
Verify plugin structure (macos-14)	22s
Template build smoke (B1+B2 regression guard)	19s
	1m 25s

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