kai-proof-builderlisted

## Objective A proof library at `workspace/proof-library/` where every asset carries a source, a permission status, and a readiness verdict — and where gaps are documented as findings rather than filled with plausible copy. Cleared assets are rewritten at three lengths and can be pulled by downstream skills by provenance ID; nothing else may be used at all. **Proof is collected, never composed. If it cannot be traced to a real source, it does not exist.** Missing proof is itself a finding: "no usable transformation proof exists — run `/kai-case-study` with the two clients named in the CRM export" is a correct output of this skill. ## Done when Work type `audit-report` — floor **E3/C4/O1** (`harness/eco-floors.yaml`): client-facing analysis whose every quantitative claim must resolve to a collector source. - **E3** — a named human approved the exact `_provenance.md` ledger and the rendered assets. This skill builds a library; it never publishes. - **C4** — the Kai Data Provenance Rule in full (collector ran before any number was written, mode declared, every quantitative claim citing a collector source, every gap in `_data-gaps.md` rather than in a guess), plus the FTC gate below, `banned_word_check` clean, and Four U's at **12/16** for full stories and fusion pieces, **10/16** for stat lines and blurbs. - **O1** — the summary names the single highest-value next action with an owner and a date (e.g. "get written permission from the P-002 customer — strongest transformatio