[Tristan-Stoltz-ERC]

Summary

Stacks on PCB route evaluator PR #2482 and hardens two evidence boundaries.

Anytime archive provenance

• Bumps the anytime archive/checkpoint schema to v0.2.
• Requires every incumbent archive to carry full router method/build/config pins and a machine identity (OS, architecture, CPU, cores, memory).
• Each checkpoint repeats method ID, config digest and environment; archive recording rejects cross-method, cross-config and cross-environment mixing.
• The archive initializer that previously derived identity from only board/manifest/DRC policy is removed; initialization now requires explicit router and environment pin JSON.
• Adds regression tests for method, configuration and environment mismatch.

DRC parse-boundary integrity

• Re-resolves output-board and DRC-report paths under the canonical run root and re-hashes the actual bytes immediately before native DRC JSON parsing.
• Adds a deterministic test seam that mutates a verified DRC report after the initial artifact-hash pass and before parse. The test requires the parse-boundary re-hash to reject the changed file.

These are provenance consistency checks, not cryptographic execution attestation; method pins do not by themselves prove which process generated the output. Runs still need invocation/exit-status/log evidence.

Evidence status

Latest exact head: 3201cede1cd4840d1734154609d2b421033a59b5. Focused workflow #39749872486 is queued after adding the deterministic parse-boundary mutation regression. No passing result is claimed for this head yet. The tests use synthetic files and do not establish real-router performance, signal/power integrity, manufacturability, physical conformity, safety or release readiness.