feat: Goose integration + dedicated install command

[jlowin]

Adds Goose as an install target using its deeplink protocol. Running fastmcp install goose server.py generates a goose://extension?... URL and opens it, prompting Goose to install the server.

Goose requires uvx rather than uv run, so the command builds a uvx invocation instead of going through UVEnvironment.build_command():

fastmcp install goose server.py --with pandas --python 3.11
# opens: goose://extension?cmd=uvx&arg=--python&arg=3.11&arg=--with&arg=pandas&arg=fastmcp&arg=run&arg=server.py&id=server&name=server&description=...

The platform-specific URL opener (open/xdg-open/startfile) is extracted from cursor.py into shared.py so both Cursor and Goose deeplinks share it.

Also adds links to each AI assistant's website in the integration docs opening paragraphs (Claude Code, Claude Desktop, ChatGPT, Cursor, Gemini CLI, Goose).

[chatgpt-codex-connector]

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[coderabbitai]

Walkthrough

Adds Goose integration to docs and CLI: new docs/integrations/goose.mdx and docs.json/navigation entries, updates patterns and Python SDK install lists. Implements Goose install commands in src/fastmcp/cli/install/goose.py (deeplink generation, uvx command assembly, install_goose and goose_command) and registers the goose subcommand. Adds shared.open_deeplink in src/fastmcp/cli/install/shared.py and refactors cursor.open_deeplink to call it. Converts several integration docs to use hyperlink formatting.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description lacks the required Contributors Checklist and Review Checklist items from the template; only narrative description is provided without checkbox confirmations.	Complete the description by adding both the Contributors Checklist and Review Checklist sections with appropriate checkboxes marked as completed.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add fastmcp install goose command' accurately and concisely summarizes the main feature addition in the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/goose-install

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[coderabbitai]

Actionable comments posted: 5

🧹 Nitpick comments (2)

docs/patterns/cli.mdx (2)

300-305: Use active voice and second person in the Goose entry.
Consider rephrasing to match the doc style guidelines.

✍️ Suggested wording

-- **Goose** - Installs via deeplink that opens Goose for user confirmation (uses `uvx`)
+- **Goose** - You install via a deeplink that opens Goose for confirmation (uses `uvx`)

As per coding guidelines, use active voice over passive voice and write instructions in second person in MDX documentation.

---

387-389: Add expected outcome + fallback guidance for the Goose install example.
A short expected result and a likely failure path (deeplink not opening) will make this example more actionable.

📝 Suggested add-on

 # Install in Goose (uses uvx deeplink)
 fastmcp install goose server.py --with pandas
+
+# Expected: Goose opens the install dialog.
+# If it doesn’t, copy the deeplink from the CLI output and open it manually,
+# or use `fastmcp install mcp-json` for a manual config.

As per coding guidelines, include expected outputs and troubleshooting for likely failure points in MDX documentation.