fix(skills): namespace ClawHub skill slugs

[davida-ps]

Summary

• Keep skill directories, skill.json names, release tags, GitHub release artifacts, and npx skills install commands unchanged.
• Map only the ClawHub slug before clawhub inspect, clawhub publish, and GitHub release ClawHub install instructions.
• Preserve existing clawsec-* ClawHub slugs unchanged and map non-clawsec-* skill names into the required clawsec-* namespace.
• Share CI platform parsing across the slug resolver, install docs validator, and trust packet generator.

Testing

• node scripts/test-skill-clawhub-slug.mjs
• node scripts/test-skill-release-workflow.mjs
• for test_file in scripts/test-skill-*.mjs; do node "$test_file"; done
• npx eslint scripts/ci/skill_platforms.mjs scripts/ci/resolve_clawhub_slug.mjs scripts/ci/validate_skill_install_docs.mjs scripts/ci/generate_skill_release_trust_packet.mjs scripts/test-skill-clawhub-slug.mjs scripts/test-skill-release-workflow.mjs --max-warnings 0
• npm run build

Release Note

No release tags were pushed from this PR. After merge, derive changed release tags from the merged PR diff, push one tag at a time, and wait for each Skill Release workflow before pushing the next tag.

[davida-ps]

Replaced the original broad rename diff with the intended pipeline-only fix.

What changed now:

• Skill directories, skill.json names, release tags, GitHub release artifacts, and npx skills commands stay unchanged from origin/main.
• The release workflow resolves a separate ClawHub slug before clawhub inspect, clawhub publish, and the GitHub release ClawHub install line.
• Existing clawsec-* slugs pass through unchanged; non-clawsec-* skills map to the required clawsec-* ClawHub namespace.
• Manual ClawHub republish preserves the current slug helper before checking out older tags, so older failed release tags can still be republished with the new slug mapping.

Validation run locally:

• node scripts/test-skill-clawhub-slug.mjs
• node scripts/test-skill-release-workflow.mjs
• for test_file in scripts/test-skill-*.mjs; do node "$test_file"; done
• npx eslint scripts/ci/resolve_clawhub_slug.mjs scripts/test-skill-clawhub-slug.mjs scripts/test-skill-release-workflow.mjs --max-warnings 0
• npm run build

No release tags were pushed.