[lemarjohnny781]

Summary

• Add a read-only CLI audit for transaction and fee-bump signature coverage.
• Separate cryptographic verification from signer weights, account thresholds, operation sources, and supported extra-signer checks.
• Report unavailable or unsupported authorization context as inconclusive, with JSON and human-readable output.
• Document supported rules and limitations; add focused transaction fixtures and tests.
  closes ISSUE-118: Add Stellar Transaction Envelope Signature Coverage and Threshold Readiness Audit #152

Verification

• npx jest --runInBand tests/transaction-signature-coverage-audit.test.ts (9 tests passed).
• Existing fee-bump and operation-source tests pass. A related legacy passphrase-audit test still fails on its noKeys expectation; full-suite testing also encounters pre-existing TypeScript parse errors in src/services/trustline-exposure.ts.

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