feat(opencrabs): deploy install slice (#152) — DRAFT, needs live verify

[jaylfc]

Adds tinyagentos/scripts/install_opencrabs.sh, the deploy-time installer the deployer auto-runs for framework==opencrabs (additive; no effect on other frameworks).

What it does, in-container:

• Downloads the pinned per-arch opencrabs release binary to /usr/local/bin/opencrabs.
• Writes a LiteLLM custom-provider config (config.toml/keys.toml) pointing opencrabs at the local proxy.
• Installs an SSE bridge (taos-opencrabs-bridge.py + systemd unit) that consumes the bus and drives opencrabs run --format json --auto-approve. The bridge machinery is the proven shape from install_smolagents.sh; only _run differs.

Why draft: the provider config schema (active-provider selection, base_url path, whether run needs prior onboarding) is researched but NOT verified against a live opencrabs run. The VERIFY markers in the script and ~/.taos-team/opencrabs-deploy-notes.md list exactly what to confirm. Hold for a live Fedora-worker deploy round-trip before un-drafting.

Checks: bash -n clean, embedded bridge python compiles, ascii-clean.

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[jaylfc]

Closing this month-old draft to free a fleet throttle slot. The work is still tracked as the OpenCrabs deploy slice (#152) and needs live verification, which this draft never received. Reopen or re-card when a live agent stack is available to verify it.