feat(compliance): add claim-integrity-guard skill

[rohanpoudel2]

What

Adds a new compliance skill, Claim Integrity Guard, at compliance/claim-integrity-guard.md, registered in manifest.json under the compliance category (icon: shield-check).

Why

In regulated consumer-health copy, superscript markers (*, †, ‡, §) are legal promises that a disclosure exists and is findable. Store migrations routinely carry product copy — markers included — while leaving the footnote block, disclosure page, and theme partials behind on the old platform. This skill finds that gap and closes it:

• Regime-gates every test (Step 0) — determines product category (supplement / cosmetic / food / CBD / non-claim) and open markets before applying any jurisdiction's disclosure rule; a cosmetics-only catalog can never produce a DSHEA finding
• Enumerates every copy-bearing surface to the end of pagination, normalizes imported HTML (entities, <sup> wrappers, unicode variants) before tokenizing markers
• Detects the store's own marker convention before falling back to the conventional reading, and tests disclosure existence and placement as separate questions
• Scans for candidate disease-claim language as leads for human review (with false-positive/false-negative limits stated), plus migration residue (off-domain redirects, leftover platform URLs)
• Reports findings by severity first, phrased strictly as statements about the audited store's data — never the company's compliance posture; remediates only after an approved human_in_the_loop proposal, recovers disclosure copy from the source site rather than composing it, never rewrites claims or normalizes markers by machine, and verifies every mutation by re-read

Includes an anonymized worked example (a supplement catalog imported from Shopify into a sandbox store) plus gotchas: cursor pagination, page copy living in description not body, encoded markers, product.title required on PATCH, and * overloading in CSS/markdown.

Validation

• python3 -m unittest discover -s scripts -p 'test_*.py' — 16 tests OK
• python3 scripts/validate_catalog.py — catalog validation passed: 42 skills, 6 workflows