feat: redesign as opencode plugin with auto-injected provider and auth hook

- rename package to opencode-qoder-plugin
- move @opencode-ai/plugin to dependencies (required by Bun installer)
- config hook injects all 10 Qoder models automatically, no provider block needed
- auth hook checks ~/.qoder/.auth/user and prompts 'qoder login' if absent
- add GitHub Actions CI (test on push) and Publish (release on tag push)
- add AGENTS.md with project structure and release process
- update README: single-line plugin install, remove manual provider config

Author: yee.wang

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - run: npm test

.github/workflows/publish.yml

@@ -0,0 +1,24 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          registry-url: https://registry.npmjs.org
+          cache: npm
+      - run: npm ci
+      - run: npm publish --provenance
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

AGENTS.md

@@ -0,0 +1,69 @@
+# AGENTS.md
+
+This is **opencode-qoder-plugin** — an [opencode](https://opencode.ai) plugin that injects Qoder AI models via a `config` hook. No manual provider configuration needed by users.
+
+## Project Structure
+
+```
+opencode-qoder-plugin/
+├── index.ts                     # Plugin entry — config hook + auth hook
+├── provider.ts                  # Exports createQoderProvider() (opencode npm loader entry)
+├── src/
+│   ├── models.ts                # 10 built-in model definitions (injected by config hook)
+│   ├── qoder-language-model.ts  # LanguageModelV2 implementation (doGenerate + doStream)
+│   ├── prompt-builder.ts        # AI SDK CallOptions → Qoder prompt / multimodal builder
+│   └── vendor/
+│       ├── qoder-agent-sdk.mjs  # Vendored Qoder Agent SDK — DO NOT modify
+│       └── qoder-agent-sdk.d.ts # SDK type declarations — DO NOT modify
+└── tests/
+    ├── models.test.ts
+    ├── plugin.test.ts
+    ├── qoder-language-model.test.ts
+    └── integration/
+        ├── real-api.test.ts       # Requires `qoder login`
+        └── opencode-cli.test.ts
+```
+
+## Key Design Decisions
+
+- **Plugin, not provider config** — `index.ts` uses the `config` hook to inject `provider.qoder` automatically. Users only need `"plugin": ["opencode-qoder-plugin"]` in their `opencode.json`.
+- **Auth hook** — checks `~/.qoder/.auth/user` for login state. If absent, surfaces a prompt telling users to run `qoder login`.
+- **Vendored SDK** — `src/vendor/qoder-agent-sdk.mjs` is a bundled copy of `@ali/qoder-agent-sdk` (internal registry). Do not replace it without testing the full streaming pipeline.
+- **Model merging** — builtin models from `src/models.ts` are injected first; any `provider.qoder.models` overrides in the user's `opencode.json` take precedence.
+
+## How the Streaming Pipeline Works
+
+```
+opencode → QoderLanguageModel.doStream()
+  → buildPromptFromOptions()   # text or multimodal (base64 image)
+  → resolveQoderCLI()          # finds latest ~/.qoder/bin/qodercli/qodercli-<version>
+  → SDK query()                # streams SDKMessage events
+      ├─ stream_event path     # incremental text / tool-input deltas (preferred)
+      └─ assistant path        # full-block fallback
+  → ReadableStream<V2StreamPart>
+```
+
+## Development
+
+```bash
+npm install
+npm test          # unit tests, no network required
+```
+
+## Release Process
+
+Releases are automated via GitHub Actions:
+
+1. Update `version` in `package.json`
+2. Commit and push: `git commit -m "chore: release vX.Y.Z"`
+3. Tag and push: `git tag vX.Y.Z && git push origin vX.Y.Z`
+4. The **Publish** workflow triggers automatically and publishes to npmjs.com using `NPM_TOKEN` secret
+
+> **NPM_TOKEN** must be set in GitHub repo Settings → Secrets → `NPM_TOKEN`.  
+> Use an **Automation** type token from https://www.npmjs.com/settings/~/tokens to bypass OTP.
+
+## What NOT to Do
+
+- Do not modify `src/vendor/` files without thorough integration testing
+- Do not add a `provider.qoder` block to `opencode.json` — the plugin injects it automatically
+- Do not move `@opencode-ai/plugin` back to `devDependencies` — it must be in `dependencies` so opencode's Bun installer pulls it