claw: TRI CLAW social-visual skill cards -- format, scene, uniqueness gate, publish consent (Closes #10570)

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Closes #10570. Sub-issue R5 of epic #10560. Stacked on #10566 (reel_factory.t27, not yet on master): the base is that PR's branch, so this diff is only R5. Retarget to master once #10566 merges.

TRI CLAW now has t27 skill cards for making social-media visuals from the content factory's plan, so it stops choosing sizes and scenes by judgement and cannot publish a near-duplicate or an unapproved post.

What is added

• specs/claw/social_visuals.t27 -- the four decisions, once, with 14 tests. It imports reel_factory (formats, arche, too_similar, carousel_slides) and reel_topics::TOPICS; no table is copied.
  • format: pick_format(channel, kind) over 8 channels and 5 kinds; a moving format only for a moving kind; FMTS ("unsupported") for a pair with no format.
  • scene: scene_for(t) is reel_factory::arche; an item outside the course gets ARCHS (no plan).
  • gate: gate_verdict(items, ran, pairs, worst); blocks an empty, unmeasured, incomplete or too-alike set.
  • consent: publish_verdict(...); allowed only with a passed gate and the owner's yes, from the owner's chat, for the same post digest and channel; a digest of 0 approves nothing.
• specs/skills/t27-social-visual-{format,scene,gate,consent}.t27 -- schema-only cards per specs/skills/README.md, each with a basic_constants test, each naming the law and reel_factory in SPECS.
• 5 seals and 5 t27b ledger rows (max_not_pass unchanged).

Lab results (Railway lab, nothing run on the Mac)

• t27c test-report: law 14/14 pass, 0 vacuous; each card 1/1 pass, 9 asserts, 0 vacuous.
• t27c seal --save then --verify: all five "all hashes MATCH".
• t27b build --elf: all five (and reel_factory) produce an object, rc 0.
• Hand-written code outside t27: 0 lines.

Please look at

• t27b JIT verdict is not run here. The lab is x86 and t27b test refuses it (the JIT is arm64 only), the same as for t27f: reel_factory.t27 -- content features to a unique scene plan per item (Closes #10561) #10566. The five ledger rows say pass on the strength of the front end and the object build; the arm64 ratchet is the check. If it disagrees, change the row.
• Cards have SOURCE = "". There is no SKILL.md behind them, so the site will label them spec-only (a recognised witness label). Say so if you want .claude/skills/ bodies written as a follow-up.
• Chosen, not verified: the channel-to-format table is this module's choice among the factory's eight formats, not read from each network's current rules; the 850 permille bound is still the factory's unmeasured starting value; the gate compares stills within one run only; only the 27 course lessons have plans; digest computation and "did this come from the owner's chat" are the publisher host's job. Publishing itself is out of scope. These are stated in the spec header.

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