docs: skill-publishing layout standard (BRO-1561)

[broomva]

Adds a Publishing standard section to the skills roster: skills must live in skills/<name>/ (Agent Skills standard) — a top-level SKILL.md + sibling scripts/ at a repo root installs only SKILL.md on remote npx skills add (CLI repo-root special-case), yielding a non-functional skill. Documents the why, the keep-your-repo-name fix (git mv → skills/<name>/), and the validation discipline (--list necessary-not-sufficient; runnable clean-room install is the gate; skillify now machine-enforces it). Doc-only.

Part of BRO-1561. Companion to the merged kg/p9/role-x restructures + the skillify gate.

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Reviewing files that changed from the base of the PR and between 314a0e6 and 0c6e79e.

📒 Files selected for processing (1)

• references/skills-roster.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/bro-1561-publishing-standard

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