Simplify spec: remove sub, move compensation and policy to ext
- Remove sub claim (always equals iss, added no information) - Move compensation_required and compensation_reason to ext keys - Move pol, pol_decision, pol_enforcer to ext keys - IANA JWT Claims table reduced from 11 to 6 registered claims - Trim witness attestation section to concise guidance - Fix remaining ledger-mandatory language in verification step 15 and minimal implementation guidance Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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