fix: separate content form from evidence sufficiency

[KimGLee]

What changed

• establishes a Kernel-level claim-preserving transformation invariant
• separates natural content form from evidence-backed rewrite disposition
• represents missing mechanism or relations as source-gap instead of authorizing invention
• recompiles the affected Runtime Cards so the rule reaches ordinary execution
• corrects the Agent Atlas example ownership direction: Cambium owns the public example; adopters explicitly adopt it

Root cause

The existing class-3 rule coupled a formatting classification with permission to add causal or mechanistic prose. Once selected, there was no compliant state for insufficient source evidence, so completing the form rule could require inventing a claim.

Validation

• make check
• python3 -m unittest Tools.tests.test_profile_examples Tools.tests.test_profile_contract Tools.tests.test_check_profile Tools.tests.test_stamp_cards_budget Tools.tests.test_stamp_cards_commands Tools.tests.test_stamp_cards_semantic_coverage Tools.tests.test_stamp_cards_skeleton
• 212 focused tests passed

Closes #142