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Closes #10917 (epic #10915, map #11038).

What

New spec-only skill card specs/skills/t27-social-pack.t27: the one card that strings the five existing social-visual cards into the order of one post -- pick the format, render the reel with the idea factory, take the cover still, weigh the caption against its channel, run the uniqueness gate, then wait for the owner's explicit yes. The card copies none of their law.

• FR-001 constants: KIND = "skill", ID = "t27/social-pack", NAME = "Social Pack", REPO = "t27", SOURCE = "" (no SKILL.md yet, comment carried over), COMMAND = "/social-pack", ENABLED = true, TIMEOUT_MIN = 30.
• FR-002 SPECS: exactly specs/t27f/idea_factory.t27 and specs/t27f/lesson_reel.t27, both on master.
• FR-003 TAGS includes social-visual and t27f.
• FR-004 SUMMARY_EN: one ASCII sentence naming the six steps and that nothing is published without the owner's explicit yes (the consent card).
• FR-005 header names the five cards by ID (t27/social-visual-format, t27/social-visual-scene, t27/social-visual-gate, t27/social-visual-consent, t27/reel-beat). Honest pending marks: the caption rule is pending (specs/t27f/post_caption.t27, t27f: post_caption.t27 -- a caption fits its channel: X 280 with links as 23, Telegram 1024, Instagram 2200, hashtag caps #10916, open PR t27f: post_caption.t27 -- a caption fits its channel (Closes #10916) #11667); the cover still itself landed (t27f: idea factory cover still -- COVER=1 writes the reel's settled title frame, byte for byte (Closes #10828) #10830) so it is not marked pending -- only its scene choice (t27f idea factory: cover at a chosen scene (COVER_AT, cover_frame_at), scene 0 stays byte-identical #11028, open PR t27f: idea factory cover from a chosen scene -- COVER_AT, cover_frame_at (Closes #11028) #11669) is. Marking a landed step pending would be a false claim; the issue text predates t27f: idea factory cover still -- COVER=1 writes the reel's settled title frame, byte for byte (Closes #10828) #10830's merge.
• FR-006 test basic_constants asserts every FR-001 constant.

Verification (measured locally, t27c 0.5.2 / t27b native)

• t27c parse exit 0; t27c test-report -- 0 FAIL, 1 pass
• t27c seal --save then seal --verify -- all hashes MATCH, exit 0 (.trinity/seals/skills_skill_t27_social_pack.json)
• t27b test specs/skills/t27-social-pack.t27 -- exit 0
• grep -c t27/social-visual-consent == 1; ledger row specs/skills/t27-social-pack.t27 -> pass inserted in sorted order (between t27-self-host and t27-social-visual-consent); max_not_pass untouched
• Modeled on specs/skills/t27-reel-beat.t27; ASCII-only (L3)

Coordination

Claimed per the #11038 protocol; lane claude/t27f-social-pack, worktree t27-wt-t27f, off origin/master @ a7f822b. Merge is the owner's call.

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Superseded by the batch PR #11668 (same spec specs/skills/t27-social-pack.t27 + ledger row, one lane). Coordination protocol: #11038. Reopen if this lane carries work the batch lacks.