fix(torghut): fail closed on legacy parity projections

[gregkonush]

Summary

• treat persisted legacy TigerBeetle parity projections as stale and unsatisfied rather than as valid current evidence
• fail closed on malformed non-string projection_version values with EconomicLedgerError instead of an unhandled TypeError
• document that parity is derived from the same canonical economic reducer while independently validating persisted projection evidence
• add focused regressions for legacy versions, malformed versions, and current-version parity
• replace the prior patch-runner head with direct source commits rebased onto current main

Related Issues

Remediates the unresolved Codex findings on #12766 and #12778 and the actionable findings introduced on this remediation PR.

Testing

• env LD_LIBRARY_PATH=/workspace/runtime-libs .venv/bin/pytest tests/economic_ledger/test_legacy_parity_payload_version.py tests/economic_ledger/test_tigerbeetle_parity.py -q (14 passed)
• Ruff format and lint passed on all changed Python files
• complete required GitHub CI remains blocking before merge

Rollout

This changes the Torghut runtime image and status semantics. After merge, the image build, immutable digest promotion, Argo sync, migration/smoke hooks, current workload readiness, restarts, logs, /trading/status, and post-deploy verification must be checked before source threads are resolved.

Breaking Changes

Legacy or malformed persisted parity projections now fail closed as stale/unavailable instead of being accepted or raising an unhandled exception.

Checklist

• Testing section documents exact commands and results.
• Screenshots are not applicable; Breaking Changes is filled in.
• Documentation and rollout requirements are updated.

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[gregkonush]

@codex address the unresolved current-head review feedback end to end. Guard the historical-version membership check with isinstance(projection_version, str) so non-scalar sealed values reach strict validation and fail with EconomicLedgerError, keep unknown/future versions strict, preserve the v1/v2 stale-unsatisfied behavior and documentation correction, add or retain focused regressions for both cases, run the relevant Torghut gates, and push the fix to this PR branch.

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