Add FastMCPApp — a Provider for composable MCP applications (#3385)

* Add FastMCPApp — a Provider for composable MCP applications

* Wire Prefab callable resolver via to_json(tool_resolver=) parameter

* Remove inspect.signature compat check, use try/except until prefab 0.10.0

* Address review: fix add_tool registry gaps, normalize auth errors, bump prefab to 0.10.0

* Register global key after _add_component succeeds

* Simplify: extract decorator dispatch, use get_fastmcp_meta, expose get_global_tool

* Remove prek from Marvin workflows

These workflows run Claude to respond to /marvin mentions — linting
the repo is unnecessary and fails without renderer deps installed.

* Return ResolvedTool from callable resolver, add contacts example

The callable resolver now returns ResolvedTool (from prefab_ui) instead of a
plain string, carrying metadata like unwrap_result that the renderer needs to
correctly handle structuredContent envelopes. The unwrap_result flag is derived
from the tool's x-fastmcp-wrap-result output schema marker.

* Bump prefab-ui requirement to >=0.11.0

* Remove stale ty ignore comments now that prefab-ui 0.11 is published

.github/workflows/marvin-comment-on-issue.yml

@@ -36,11 +36,6 @@ jobs:
       - name: Install dependencies
         run: uv sync --python 3.12
 
-      - name: Run prek
-        uses: j178/prek-action@v1
-        env:
-          SKIP: no-commit-to-branch
-
       - name: Generate Marvin App token
         id: marvin-token
         uses: actions/create-github-app-token@v2

.github/workflows/marvin-comment-on-pr.yml

@@ -38,11 +38,6 @@ jobs:
       - name: Install dependencies
         run: uv sync --python 3.12
 
-      - name: Run prek
-        uses: j178/prek-action@v1
-        env:
-          SKIP: no-commit-to-branch
-
       - name: Generate Marvin App token
         id: marvin-token
         uses: actions/create-github-app-token@v2