chore: remove dead sync-skill-content scaffolding

[elementalsouls]

scripts/sync-skill-content.sh implements a two-tier design: skills/*/SKILL.md are meant to be "structured outlines," and the script populates them by copying from canonical sources at docs/full-skills/*.SKILL.full.md.

That design was never shipped. docs/full-skills/ has no git history — it was never committed — and the skills/*/SKILL.md files are already the full content (offensive-osint ≈ 4,700 lines / 185 sections). The script has therefore always been a no-op:

$ bash scripts/sync-skill-content.sh --check
==> Syncing SKILL.md content from docs/full-skills/
  ⚠  Source missing: .../docs/full-skills/osint-methodology.SKILL.full.md
      (Skipping. The structured-outline SKILL.md will remain in place.)
  ⚠  Source missing: .../docs/full-skills/offensive-osint.SKILL.full.md
  # exit 0

It's harmless to CI (exits 0), but it drags misleading docs behind it — README and installation.md tell every new user to chmod +x and run a script that populates nothing, and claim SKILL.md ship as outlines by default. The run-claude-osint skill already documents it as "a no-op in a fresh clone."

Removed

• scripts/sync-skill-content.sh — the only file under scripts/, so the directory goes with it.
• README.md / docs/installation.md — the chmod+run steps, the periodic-resync line, and the two "structured-outline" troubleshooting sections. Install collapses to cp -r skills/* ~/.claude/skills/.
• SECURITY.md — reworded the bullet that scoped provenance to docs/full-skills/.
• .claude/skills/run-claude-osint/ — dropped smoke check docs: bump version metadata to 2.2.0 (CHANGELOG, READMEs, SECURITY, smoke test) #5 (h1 check renumbered to docs: bump version metadata to 2.2.0 (CHANGELOG, READMEs, SECURITY, smoke test) #5), the sync skill content trigger, the no-op gotcha, and a stale shellcheck ./scripts line (ci: lint every shell script, not just ./scripts #17 already dropped scandir).
• skills/{offensive-osint,osint-methodology}/README.md — the "or docs/full-skills/… if this is the outline variant" clause.

Verified

• smoke.sh --no-net → PASS (5 checks, no sync step)
• markdownlint-cli2@0.15.0 → 0 errors
• shellcheck -S warning → clean on the remaining scripts
• All 9 SKILL.md frontmatter valid
• cp -r skills/* installs full content (9 skills, offensive-osint intact)

Net −131 lines. No behavior change — the removed script never did anything on a real clone.

🤖 Generated with Claude Code

[vnbochkarev-netizen]

🛡️ ViBo SkillQA report (v0.1.5)

Grade: C (50/100) — fail_count: fail_count=1

�[33m[!]�[0m Static scan — warn (1977 ms)
�[33m[!]�[0m Sandbox run — warn (0 ms)
�[31m[✗]�[0m Log audit — fail (7 ms)
�[32m[✓]�[0m Novelty — pass (0 ms)
[·] certificate: qa_reports/email-domain-security/2026-08-19_195200902528.md
[·] json: qa_reports/email-domain-security/2026-08-19_195200902528.json
�[31m[✗]�[0m Grade: C (50/100) — fail_count=1
[·] skipped: load, parallel, compat

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