feat(kv260): add read-only status surface for IDE

[hkimw]

Refs pccxai/pccx-launcher#70
Refs pccxai/pccx-lab#160

Summary

• Add local read-only KV260 status readers for launcher NPUStatus and lab TraceManifest fixture JSON.
• Add a pure VS Code prototype Kv260StatusPanel with preflight checklist and a read-only display command.
• Add sv-ide kv260-status / pccx-ide kv260-status text+JSON CLI output, tiny fixtures, docs, and type-only tests.

Evidence

• python3 -m compileall -q src tests
• PYTHONPATH=src python3 -m pytest -q
• for test in editors/vscode-prototype/test/*.test.mjs; do node "$test" || exit 1; done
• git diff --check
• python3 scripts/check-source-headers.py
• node editors/vscode-prototype/test/static-boundary.test.mjs
• PYTHONPATH=src python3 -m pccx_ide_cli kv260-status
• PYTHONPATH=src python3 -m pccx_ide_cli kv260-status --format json

Notes

• Launcher NPUStatus is mirrored locally; no cross-repo import is configured in this repo.
• Lab manifest parser is real for the lab#160 file-replay JSON shape.
• No SSH, board command, launcher execution, pccx-lab execution, shell execution, KV260 control, allowlist expansion, provider call, telemetry, upload, or write-back is implemented.
• shellcheck is not installed in this environment; this slice is gated on Python, JavaScript, JSON fixture, docs, static-boundary, and hook claim checks.