fix(bench): validate native ladder parity and cleanup evidence

[DecisionNerd]

Native OVHC-AGENCY results can now satisfy parity readiness using their ordinary lifecycle receipts and verified work-root cleanup. The adapter uses the shared native-rung validator instead of interpreting host results as Fly-provider bundles or duplicating receipt validation.

Closes #1112. Refs #959. #959 retains the completed host ladder and full retirement outcomes.

The work-root inventory binds the actual result digest automatically and checks the whole work root, including unknown files, failed staging, temporary debris, symlinks, and special files. A valid completed prefix is reported separately from full S18–S26 readiness; it cannot certify the remaining ladder. Historical provider evidence keeps its explicit adapter path.

Validation on OVHC-AGENCY:

• All 343 Python harness tests passed with the compliant generator and final native host controller, including legacy producer deletion, receipt tampering, unknown/debris inventory, and incomplete-prefix rejection for full readiness.
• The parity CLI reports structural/prefix readiness separately from full S18–S26 completion.
• Retained historical S18/S19 host receipts were consumed read-only at their recorded identity; no new host run or corrected-generator claim was made for them.
• Fast checks, gate registry, formatting, and independent source review passed before the unchanged final host integration.

Actual benchmark execution remains one shared #900 ladder after the finite product-fix batch is integrated. This PR does not claim S26 completion or retire legacy orchestration based on a lower-scale prefix.

Native run authorization comes from the operator instruction and explicit controller maximum-scale/rung invocation. Parity receipts validate execution evidence and cleanup; they do not independently prove operator permission. #959/#900 retain the actual authorized full-ladder outcomes.

Rebased unchanged onto current main after #1108. Final Python smoke and all 343 harness tests passed, along with make pre-push-fast. Exact-head CI passed at 657682c4a503f56cea05a8b3983ee8fbf31203f8, including the authoritative Bazel Rust suite, native lifecycle producer, binding packaging, platform durability, concurrency matrix, and CI Gate. Squash merged; #1112 is closed and #959 remains open.

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