feat: Sign glyph images, anchor review flow, loop UX, and experiment ID consolidation #333

Job	Run time
Indus public validation checks	12s
Frontend tests (Playwright)	25m 15s
Evidence Graph script smoke tests	15s
Backend tests (pytest)	1m 50s
Shell wrappers (ubuntu-latest)	32s
Shell wrappers (macos-latest)	28s
Shell wrappers (windows-latest)	1m 11s
	29m 43s

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