Loopy: save and reuse project loops via LOOPS.md

[mberman84]

Summary

Adds a ninth path to the Loopy skill: saving a delivered loop to the project and reusing saved loops later.

• Save on request only. When the user asks to keep a loop, Loopy appends it to LOOPS.md at the project root (name, one-sentence explanation, exact prompt, save date). Adaptations of published loops also record the source URL and its modified date for later drift detection.
• One short offer, never nagging. After delivering a reusable loop, Loopy may offer once to save it — no repeat offers, no unsolicited writes, no secrets in the file.
• Reuse in later sessions. Before finding or crafting, Loopy reads LOOPS.md when present and can recommend a saved project loop, clearly labeled as the project's own loop, never as published. Saved adaptations whose upstream source has since changed get a one-sentence heads-up with an offer to compare.
• Mirrored into the loop-library compatibility alias, documented in the README path table, and guarded by new repository checks.

Verification

• node loop-library/scripts/check.mjs (including new assertions; skill and alias bodies verified identical)
• npm --prefix loop-library/worker run check (47/47 tests pass)
• node --check loop-library/site/script.js, JSON manifests validated, git diff --check clean

Skill and docs only — no site or Worker changes, nothing to deploy.