feat(ground): inspect and export regional trajectories

[d-sorgcodexagent]

Summary

• add matched PyQt6 and React raw regional trajectory inspection with SI units, phase/frame labels, and a 256-row rendering bound with exact truncation disclosure
• add semantic-lossless canonical evidence export: bounded atomic UTF-8 native save and canonical browser JSON download
• preserve validated evidence transactionally across cancellation and failures; the browser does not run or recompute physics
• update SPEC, campaign manifest, and canonical handoffs in the same implementation commit

Verification

• 209 Python/PyQt tests passed
• React: 112 files / 694 tests passed
• focused independent rerun: 6 Python and 4 React tests passed
• production build: 204 modules
• strict MyPy, Ruff/format, TypeScript, zero-warning ESLint, manifest validation, documentation governance, module-size budget, placeholder scan, and diff checks passed
• independent review found no P0-P3 issues

Remaining release blockers

Executor input construction/invocation, interpolation/playback, measured calibration, compiled-runtime and downstream parity, protected CI, review, and release remain open. This PR does not complete #4267 or #4271.

Addresses #4271
Part of #4267

[dieterolson]

Consolidated into #4409. Closing to reduce CI/CD runner load.