Implements the foundation of the local observation dashboard described
in docs/11-gui-streamlit.md:
* gui/data_layer.py — read-only wrappers over Repository (system_state,
open positions) and audit_log (tail iteration, chain verify). The GUI
never imports runtime/ nor calls MCP services.
* gui/main.py — Streamlit entry point with sidebar (engine health
badge, kill switch banner, last health check age), home overview.
* gui/pages/1_📊_Status.py — engine status with colored health banner,
kill switch detail, audit anchor, open positions table.
* gui/pages/2_🔍_Audit.py — live audit log stream (newest-first),
event filters, hash-chain integrity verify button.
* cli.py gui — replaces the placeholder with os.execvpe to
`python -m streamlit run` bound to 127.0.0.1, --browser.gatherUsageStats
false; --db / --audit paths exported via env to the GUI process.
* pyproject.toml — N999 ignore for src/cerbero_bite/gui/pages/* (Streamlit
auto-discovers pages whose filename contains numbers and emoji icons).
Smoke test: GUI launches, HTTP 200 on / and /_stcore/health, data layer
correctly reflects current testnet state (engine=running, kill_switch
disarmed, 0 open positions, audit chain integra 7 entries).
353/353 tests still pass; ruff clean; mypy strict src clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adriano
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