feat(ideation,meta): A-4 filled-ratio gate + A-5 H1 modal helper (#59) #153

Job	Run time
Shell script lint	14s
Agent inventory (144 target)	4s
Template build smoke (B1+B2 regression guard)	22s
Test hooks (unit)	13s
Verify plugin structure (macos-14)	33s
Verify plugin structure (ubuntu-latest)	18s
	1m 44s

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