[Add] Containerize reproducible OpenROAD execution

[ErickOF]

• Add selectable local and containerized ORFS execution with an inmutable image digest, invoking-user ownership, configurable platform and variant, and isolated module or profile work directories.
• Add a versioned module-owned physical-evidence policy that validates nonempty DEF, GDS, ODB, SDC, and netlist deliverables plus configurable timing, electrical, and routing thresholds.
• Record container identity and hashes for physical artifacts, design configuration, constraints, reports, and policy inputs while preserving PASS, FAIL, and SKIP through the canonical flow contract.
• Integrate OpenROAD evidence with the release manifests and add a cached Nangate45 GitHub Actions fixture with image, artifacts, metric, and ownership assertions.
• Qualify concurrent execution, cache restoration, missing or empty artifacts, image configuration, unavailable runtimes, and nonzero violations, document the non-signoff boundary, and advance the methodology version to 0.8.0.