OMP session/new was dying with opaque "Internal error" when fusion-custom-tools
MCP pointed at a missing schema server, or when bare models hit unauthenticated
providers. Prefer data.details in diagnostics, resolve mcp-schema-server.cjs
from multiple package layouts, skip the tool bridge when the asset is missing,
drop stdio MCP entries whose command path does not exist, and forward common
provider env keys (ZAI/MiniMax/Kimi) into the ACP subprocess.
## Summary
- Follow-up to #2083: remove the temp `fusion-omp-mcp-schemas-*.json`
file when the OMP Fusion `fn_*` MCP tool bridge is disposed.
- Prevents schema JSON from accumulating under `tmpdir()` after every
OMP ACP session.
## Context
PR #2083 was merged before this cleanup commit landed on
`feature/omp-acp`. This cherry-picks that fix onto main.
## Test plan
- [x] `pnpm --filter @fusion-plugin-examples/omp-runtime test` (includes
dispose removes schema path assertion)
## Summary
- Add `fusion-plugin-omp-runtime` so Fusion agents can run through
operator-installed **Oh My Pi (`omp`)** over the [Agent Client
Protocol](https://omp.sh/docs/acp) (`omp acp`).
- Wire staged/bundled install, Settings → Authentication card (enable +
binary path), model discovery (`omp models` → `omp-cli/*`), and MCP
eligibility for runtime id `omp`.
- Forward Fusion `systemPrompt` via ACP `session/new`
`_meta.systemPromptOverride`.
## How operators use it
1. Install/auth `omp` (credentials under `~/.omp`).
2. Enable **Oh My Pi — via omp ACP** in Settings → Authentication
(optional binary path).
3. Set agent **Runtime Source → OMP Runtime** (`runtimeHint: "omp"`), or
pick an `omp-cli/*` model when enabled.
## Known v1 gaps
- No Grok-style Fusion `fn_*` loopback tool bridge yet (operator MCP is
forwarded; in-process custom tools are not).
- Model is fixed at spawn (`omp --model … acp`); no mid-session Fusion
model switch.
## Test plan
- [x] `pnpm --filter @fusion-plugin-examples/omp-runtime test` (unit +
live ACP when `omp` is on PATH)
- [x] Auth routes: `POST /api/auth/omp-cli`, `GET
/api/providers/omp-cli/status`
- [x] Engine `runtimeSupportsMcp("omp")`
- [ ] Manual: enable card in dashboard, select OMP runtime on an agent,
run a short chat turn
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added Oh My Pi (OMP) CLI support as an ACP-backed runtime and model
provider, including model discovery and probing.
* Added dashboard auth/status controls to enable OMP, check readiness,
and configure the local binary path (with validation).
* Exposed OMP custom `fn_*` tools via an MCP loopback bridge, plus
optional filesystem capabilities and stricter tool permission gating.
* **Documentation**
* Added/expanded OMP runtime contract and integration docs (including
the ACP session/handshake flow).
* **Tests**
* Added Vitest coverage for settings wiring, provider status, model
discovery, runtime sessions, permissions, MCP bridging, and live
connectivity.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
