feat: bake Pi coding agent into the image (proxies OmniRoute auto-fastest)

[gitricko]

Summary

Adds the Pi coding agent to the hermes-webtop image, wired to route through the existing OmniRoute auto-fastest combo — same proxy chain already used by Hermes/Claude Code.

Changes

• docker/Dockerfile: new PI_VERSION build arg (default 0.84.2); npm install -g --ignore-scripts @earendil-works/pi-coding-agent into the image.
• docker/start-pi.sh: boot-time script (runs as abc like the other start-*.sh). Ensures Pi install is abc-owned, then seeds ~/.pi/agent/models.json + settings.json only on first boot (preserves user edits on restart). No desktop shortcut (per request).
• docker/models.json: custom OpenAI-compatible provider pointing at http://localhost:20128/v1, model auto-fastest, compat flags disabled (OmniRoute is an unknown proxy to Pi).
• docker/settings.json: defaultProvider: omniroute, defaultModel: auto-fastest.
• README.md: documents the Pi addition under features.

Behavior

On container start, pi is available on PATH and defaults to omniroute/auto-fastest (no flags needed). Config is seeded once into /config/.pi/agent/, then user-editable and persisted by the existing volume.

Verification

• start-pi.sh passes bash -n syntax check.
• Dockerfile COPY *.sh / COPY *.json globs pick up start-pi.sh, models.json, settings.json automatically.
• The same Pi config + auto-fastest default was previously verified end-to-end outside the image (pi -p returned a real completion through OmniRoute).

Not done

• No docker build/push here — image build/compile is handled separately (per request).
• No desktop launcher (removed per request).

🤖 Generated with Hermes Agent

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[gitricko]

LGTM