E3.2.3 Optional OCR no-text check

Part of: Icon QA lets weak or off-brand icons pass (E3.2).

Task

Optional OCR no-text check

Tests added or updated and CI green
Docs updated when the command surface or output changes
No private registry data, local paths or private repository names in fixtures or docs

fix(content): undecodable PNG data keeps a structured icon QA failure…

fix(tests): split import for ruff E401 and correct the undecodable-ID…

test(content): icon check CLI exits 1 with logs on undecodable IDAT, …

docs(content): OCR composites the icon on the configured family card …

fix(content): icon normalize returns a structured png failure for und…

docs(content): icon normalize undecodable --in fails the png check (e…