feat: project runtime reports as execution evidence

[Pigbibi]

Summary

• add a platform-neutral, offline builder for qsl_execution_evidence_source_snapshot.v1 from existing runtime_report.v1 files
• accept only a self-attested strategy release, a matching paper/live lane, a known platform/domain, and a valid timestamp
• add regression tests and public contract documentation

Fail-closed boundary

• output copies no report summaries, diagnostics, artifacts, runtime error text, account-like values, cloud URIs, credentials, broker responses, or orders
• it marks target data and target execution as pending and always recommends parked
• it has no network publisher, broker API, platform mutation, strategy mutation, or order capability

Validation

• python3 -m unittest python/tests/test_execution_evidence_projection.py (4 passed)
• python3 -m py_compile python/scripts/execution_evidence_projection.py
• node --check --input-type=module < web/strategy-switch-console/worker.js
• git diff --check
• Ruff is unavailable on the VPS; GitHub CI remains the authoritative lint check.