feat(agents): add MiMo Code provider

[janburzinski]

Description

• add mimo code agent provider
• mimo code mcp server integration

Screenshot/Recording (if applicable)

https://cap.link/r43hk7wz6bkz9x3

Checklist

• I kept this PR small and focused
• I ran a self-review before opening this PR
• I ran the relevant local checks or explained why not
• I updated docs when behavior or setup changed
• I added or updated tests when behavior changed, or explained why not
• I only added comments where the logic is not obvious
• I used Conventional Commits for commit
  messages and, when possible, the PR title

[greptile-apps]

Greptile Summary

This PR adds MiMo Code (Xiaomi's OpenCode-based CLI agent) as a new provider, following the established pattern for OpenCode-fork integrations. The implementation is thorough and well-tested, covering the plugin definition, MCP adapter, hook plugin, icon, and shared registry entries.

• New plugin (packages/plugins/src/agents/impl/mimocode/): defines capabilities, buildCommand with --prompt/--session/--continue flags, auto-approve via MIMOCODE_PERMISSION env, and a file-drop hook plugin — all closely mirroring the OpenCode implementation.
• MCP adapter (packages/core/…/mcp.ts): mimocodeMcpAdapter wraps opencodeMcpAdapter with MiMo-specific config paths (.config/mimocode/mimocode.json), correctly reusing the shared OpenCode schema.
• One divergence in plugin-file.ts: getMimoSessionId uses a generic isNonEmptyString guard instead of the ses-prefix check present in the OpenCode plugin, which could report non-native IDs back to emdash and silently break resume via the TypeScript-side fallback.

Confidence Score: 4/5

Safe to merge with a minor fix to the embedded plugin file before the hook session-ID path is relied upon in production.

The implementation is clean and consistent throughout — every TypeScript file correctly mirrors the OpenCode pattern. The one concrete defect is in the embedded JS plugin string: getMimoSessionId uses isNonEmptyString instead of the ses-prefix check, so any non-empty string property on a session event would be forwarded to emdash and stored. The TypeScript validateSessionId acts as a downstream guard but cannot prevent the wrong value from being persisted. All other parts of the change are well-structured and covered by tests.

packages/plugins/src/agents/impl/mimocode/plugin-file.ts — the embedded plugin string needs the ses-prefix guard added to getMimoSessionId.

Important Files Changed

Filename	Overview
packages/plugins/src/agents/impl/mimocode/plugin-file.ts	Embedded JS plugin for MiMo Code hooks — getMimoSessionId uses a looser isNonEmptyString check instead of the ses-prefix validation present in the equivalent OpenCode plugin, creating a mismatch with the documented session-ID contract.
packages/plugins/src/agents/impl/mimocode/index.ts	New MiMo Code plugin definition — closely mirrors the OpenCode plugin, correctly declares capabilities, uses validateSessionId with ses-prefix guard, and wires up mimocodeMcpAdapter.
packages/core/src/agents/plugins/helpers/mcp.ts	Adds mimocodeMcpAdapter as a thin wrapper around opencodeMcpAdapter with MiMo-specific config paths — correct and minimal.
apps/emdash-desktop/src/shared/core/agents/agent-provider-registry.ts	Registers MiMo Code in the shared provider list with correct metadata, flags, and icon reference.
packages/plugins/src/agents/impl/mimocode/icon.ts	Defines the SVG icon asset with fill=currentColor for theme adaptation; single light variant, consistent with similar providers.
packages/plugins/src/agents/impl/mimocode/index.test.ts	Good test coverage for fresh prompt, auto-approve env, resume with native session ID, and UUID-seed fallback to --continue.
packages/core/src/agents/plugins/helpers/mcp.test.ts	Tests cover both write (primary config path) and read (both legacy paths) for the MiMo adapter, following existing test patterns.
packages/plugins/src/agents/registry.ts	Imports and registers the MiMo Code provider in alphabetical order, consistent with the rest of the registry.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant E as Emdash
    participant M as MiMo CLI (mimo)
    participant P as emdash-notifications plugin

    E->>M: spawn `mimo --prompt "..."` + MIMOCODE_PERMISSION env
    M->>P: "fires session.* events"
    P->>P: getMimoSessionId(event)
    P-->>E: "POST /hook {type:'session', sessionId}"
    E->>E: store providerSessionId
    Note over E: validateSessionId checks startsWith('ses')

    E->>M: resume: `mimo --session ses_abc123`
    M->>P: fires session.idle
    P-->>E: "POST /hook {type:'notification', ...}"

    E->>M: resume (no native ID): `mimo --continue`

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant E as Emdash
    participant M as MiMo CLI (mimo)
    participant P as emdash-notifications plugin

    E->>M: spawn `mimo --prompt "..."` + MIMOCODE_PERMISSION env
    M->>P: "fires session.* events"
    P->>P: getMimoSessionId(event)
    P-->>E: "POST /hook {type:'session', sessionId}"
    E->>E: store providerSessionId
    Note over E: validateSessionId checks startsWith('ses')

    E->>M: resume: `mimo --session ses_abc123`
    M->>P: fires session.idle
    P-->>E: "POST /hook {type:'notification', ...}"

    E->>M: resume (no native ID): `mimo --continue`

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/plugins/src/agents/impl/mimocode/plugin-file.ts:40-55
**Missing `ses`-prefix guard on session ID extraction**

`getMimoSessionId` uses `isNonEmptyString` rather than the OpenCode-equivalent guard that requires the value to start with `'ses'`. The `index.ts` comment and `validateSessionId` both document that MiMo Code session IDs follow `^ses.*`, but the plugin has no such check. Any non-empty string in `event.properties.info.id` or `event.properties.sessionID` on a `session.*` event would be forwarded to emdash and stored as `providerSessionId`. If that value doesn't satisfy `startsWith('ses')`, the TypeScript-side guard will silently reject it at resume time and fall back to `--continue`, discarding the native session. Aligning this with the OpenCode pattern (`value.trim().startsWith('ses')`) keeps the plugin consistent with its own contract.

_{Reviews (1): Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." | Re-trigger Greptile}