feat: Integration catalog — discovery, versioning, and community distribution

integrations/CONTRIBUTING.md

@@ -0,0 +1,135 @@
+# Contributing to the Integration Catalog
+
+This guide covers adding integrations to both the **built-in** and **community** catalogs.
+
+## Adding a Built-In Integration
+
+Built-in integrations are maintained by the Spec Kit core team and ship with the CLI.
+
+### Checklist
+
+1. **Create the integration subpackage** under `src/specify_cli/integrations/<name>/`
+2. **Implement the integration class** extending `MarkdownIntegration`, `TomlIntegration`, or `SkillsIntegration`
+3. **Register the integration** in `src/specify_cli/integrations/__init__.py`
+4. **Add tests** under `tests/integrations/test_integration_<name>.py`
+5. **Add a catalog entry** in `integrations/catalog.json`
+6. **Update documentation** in `AGENTS.md` and `README.md`
+
+### Catalog Entry Format
+
+Add your integration to `integrations/catalog.json`:
+
+```json
+{
+  "my-agent": {
+    "id": "my-agent",
+    "name": "My Agent",
+    "version": "1.0.0",
+    "description": "Integration for My Agent",
+    "author": "spec-kit-core",
+    "repository": "https://github.com/github/spec-kit",
+    "tags": ["cli"]
+  }
+}
+```
+
+## Adding a Community Integration
+
+Community integrations are contributed by external developers and listed in `integrations/catalog.community.json` for discovery.
+
+### Prerequisites
+
+1. **Working integration** — tested with `specify integration install`
+2. **Public repository** — hosted on GitHub or similar
+3. **`integration.yml` descriptor** — valid descriptor file (see below)
+4. **Documentation** — README with usage instructions
+5. **License** — open source license file
+
+### `integration.yml` Descriptor
+
+Every community integration must include an `integration.yml`:
+
+```yaml
+schema_version: "1.0"
+integration:
+  id: "my-agent"
+  name: "My Agent"
+  version: "1.0.0"
+  description: "Integration for My Agent"
+  author: "your-name"
+  repository: "https://github.com/your-name/speckit-my-agent"
+  license: "MIT"
+requires:
+  speckit_version: ">=0.6.0"
+  tools:
+    - name: "my-agent"
+      version: ">=1.0.0"
+      required: true
+provides:
+  commands:
+    - name: "speckit.specify"
+      file: "templates/speckit.specify.md"
+  scripts:
+    - update-context.sh
+```
+
+### Descriptor Validation Rules
+
+| Field | Rule |
+|-------|------|
+| `schema_version` | Must be `"1.0"` |
+| `integration.id` | Lowercase alphanumeric + hyphens (`^[a-z0-9-]+$`) |
+| `integration.version` | Valid semantic version |
+| `requires.speckit_version` | PEP 440 version specifier |
+| `provides` | Must include at least one command or script |
+| `provides.commands[].name` | String identifier |
+| `provides.commands[].file` | Relative path to template file |
+
+### Submitting to the Community Catalog
+
+1. **Fork** the [spec-kit repository](https://github.com/github/spec-kit)
+2. **Add your entry** to `integrations/catalog.community.json`:
+
+```json
+{
+  "my-agent": {
+    "id": "my-agent",
+    "name": "My Agent",
+    "version": "1.0.0",
+    "description": "Integration for My Agent",
+    "author": "your-name",
+    "repository": "https://github.com/your-name/speckit-my-agent",
+    "tags": ["cli"]
+  }
+}
+```
+
+3. **Open a pull request** with:
+   - Your catalog entry
+   - Link to your integration repository
+   - Confirmation that `integration.yml` is valid
+
+### Version Updates
+
+To update your integration version in the catalog:
+
+1. Release a new version of your integration
+2. Open a PR updating the `version` field in `catalog.community.json`
+3. Ensure backward compatibility or document breaking changes
+
+## Upgrade Workflow
+
+The `specify integration upgrade` command supports diff-aware upgrades:
+
+1. **Hash comparison** — the manifest records SHA-256 hashes of all installed files
+2. **Modified file detection** — files changed since installation are flagged
+3. **Safe default** — modified files are preserved unless `--force` is used
+4. **Clean reinstall** — unmodified files are replaced with the latest version
+
+```bash
+# Upgrade current integration (blocks if files are modified)
+specify integration upgrade
+
+# Force upgrade (overwrites modified files)
+specify integration upgrade --force
+```

integrations/README.md

@@ -0,0 +1,110 @@
+# Spec Kit Integration Catalog
+
+The integration catalog enables discovery, versioning, and distribution of AI agent integrations for Spec Kit.
+
+## Catalog Files
+
+### Built-In Catalog (`catalog.json`)
+
+Contains integrations that ship with Spec Kit. These are maintained by the core team and always installable.
+
+### Community Catalog (`catalog.community.json`)
+
+Community-contributed integrations. Listed for discovery only — users install from the source repositories.
+
+## CLI Commands
+
+```bash
+# List built-in integrations (default)
+specify integration list
+
+# Browse full catalog (built-in + community)
+specify integration list --catalog
+
+# Install an integration
+specify integration install copilot
+
+# Upgrade the current integration (diff-aware)
+specify integration upgrade
+
+# Upgrade with force (overwrite modified files)
+specify integration upgrade --force
+```
+
+## Integration Descriptor (`integration.yml`)
+
+Each integration can include an `integration.yml` descriptor that documents its metadata, requirements, and provided commands/scripts:
+
+```yaml
+schema_version: "1.0"
+integration:
+  id: "my-agent"
+  name: "My Agent"
+  version: "1.0.0"
+  description: "Integration for My Agent"
+  author: "my-org"
+  repository: "https://github.com/my-org/speckit-my-agent"
+  license: "MIT"
+requires:
+  speckit_version: ">=0.6.0"
+  tools:
+    - name: "my-agent"
+      version: ">=1.0.0"
+      required: true
+provides:
+  commands:
+    - name: "speckit.specify"
+      file: "templates/speckit.specify.md"
+    - name: "speckit.plan"
+      file: "templates/speckit.plan.md"
+  scripts:
+    - update-context.sh
+    - update-context.ps1
+```
+
+## Catalog Schema
+
+Both catalog files follow the same JSON schema:
+
+```json
+{
+  "schema_version": "1.0",
+  "updated_at": "2026-04-08T00:00:00Z",
+  "catalog_url": "https://...",
+  "integrations": {
+    "my-agent": {
+      "id": "my-agent",
+      "name": "My Agent",
+      "version": "1.0.0",
+      "description": "Integration for My Agent",
+      "author": "my-org",
+      "repository": "https://github.com/my-org/speckit-my-agent",
+      "tags": ["cli"]
+    }
+  }
+}
+```
+
+### Required Fields
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `schema_version` | string | Must be `"1.0"` |
+| `updated_at` | string | ISO 8601 timestamp |
+| `integrations` | object | Map of integration ID → metadata |
+
+### Integration Entry Fields
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `id` | string | Yes | Unique ID (lowercase alphanumeric + hyphens) |
+| `name` | string | Yes | Human-readable display name |
+| `version` | string | Yes | Semantic version |
+| `description` | string | Yes | One-line description |
+| `author` | string | No | Author name or organization |
+| `repository` | string | No | Source repository URL |
+| `tags` | array | No | Searchable tags (e.g., `["cli", "ide"]`) |
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for how to add integrations to the community catalog.

integrations/catalog.community.json

@@ -0,0 +1,6 @@
+{
+  "schema_version": "1.0",
+  "updated_at": "2026-04-08T00:00:00Z",
+  "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/integrations/catalog.community.json",
+  "integrations": {}
+}