Proposal: evidence discipline, anti-handwave, claim calibration

[neoneye]

Summary

• Adds proposal 123-evidence_discipline_anti_handwave_claim_calibration.md covering three mechanisms to strengthen PlanExe plan quality:
  • Evidence discipline: tagging claims by support type (observed, derived, estimated, assumed, speculative) with a claim ledger
  • Anti-handwave checks: detecting vague mechanism-free language (magic verbs, abstract noun shields, deferred detail) and requiring operational specifics
  • Claim calibration: matching confidence levels to actual support strength, with decomposition of compound claims

Test plan

• CI passes

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