docs: document integration search/info/scaffold subcommands (#3174)

docs/reference/integrations.md omitted three subcommands that exist in
code, breaking parity with the extension/preset/bundle/workflow
references which all document their search/info equivalents.

Added sections for:
- `specify integration search [query]` (--tag, --author)
- `specify integration info <integration_id>`
- `specify integration scaffold <key>` (--type: markdown/skills/toml/yaml)

Content mirrors the command docstrings, arguments, and options in
src/specify_cli/integrations/_query_commands.py and _scaffold_commands.py.

Fixes #3174.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Noor-ul-ain001

docs/reference/integrations.md

@@ -54,6 +54,27 @@ Shows all available integrations, which one is currently installed, and whether
 When multiple integrations are installed, the list marks the default integration separately from the other installed integrations.
 The list also shows whether each built-in integration is declared multi-install safe.
 
+## Search Available Integrations
+
+```bash
+specify integration search [query]
+```
+
+| Option     | Description        |
+| ---------- | ------------------ |
+| `--tag`    | Filter by tag      |
+| `--author` | Filter by author   |
+
+Searches the active catalog stack for integrations matching the query. Without a query, lists all available integrations. Must be run inside a Spec Kit project.
+
+## Integration Info
+
+```bash
+specify integration info <integration_id>
+```
+
+Shows catalog details for a single integration, including its description, type (CLI-based or IDE-based), author, and tags. Must be run inside a Spec Kit project.
+
 ## Install an Integration
 
 ```bash
@@ -166,6 +187,18 @@ Example:
 specify integration install generic --integration-options="--commands-dir .myagent/cmds"
 ```
 
+## Scaffold a New Integration
+
+```bash
+specify integration scaffold <key>
+```
+
+Creates a minimal built-in integration package and a matching test skeleton, then prints the next steps for wiring it up. The `<key>` must be lowercase kebab-case (for example, `my-agent`).
+
+| Option   | Description                                                       |
+| -------- | ---------------------------------------------------------------- |
+| `--type` | Scaffold template to use: `markdown` (default), `skills`, `toml`, or `yaml` |
+
 ## FAQ
 
 ### Can I install multiple integrations in the same project?