fix!: remove MCP server implementation (#45)

* refactor!: remove MCP server implementation

Remove the standalone MCP server feature to align with the Node.js SDK
which only provides MCP client functionality.

This is a BREAKING CHANGE:
- Removed `stackmcp` CLI command
- Removed `stackone_ai/server.py` module
- Removed `examples/mcp_server.py` example

The MCP client functionality for fetching tools via `fetch_tools()` is
retained and still requires the `mcp` optional dependency.

Users who were running `stackmcp` as an MCP server will need to use
alternative approaches for MCP server functionality.

* docs: update documentation after MCP server removal

- Remove MCP server section from CLAUDE.md code architecture
- Remove `make mcp-inspector` command reference from CLAUDE.md
- Update Python requirements note in README.md to reflect 3.9+ support

* chore: remove mcp-inspector task from justfile

The mcp-inspector task referenced the removed stackmcp CLI command.

* chore: remove cli extra from mcp dependency

The [cli] extra was only needed for the MCP server functionality.
The MCP client for fetch_tools() only requires the base mcp package.

Author: ryoppippi

CLAUDE.md

@@ -33,9 +33,6 @@ make test-examples    # Run example tests
 # Documentation
 make docs-serve       # Build and serve docs locally (http://localhost:8000)
 make docs-build       # Build docs for deployment
-
-# MCP Development
-make mcp-inspector    # Run MCP server inspector for debugging
 ```
 
 ## Code Architecture
@@ -57,10 +54,6 @@ make mcp-inspector    # Run MCP server inspector for debugging
    - Handles file upload detection (`format: binary` → `type: file`)
    - Resolves schema references
 
-4. **MCP Server** (`stackone_ai/server.py`): Protocol implementation
-   - Async tool execution
-   - CLI interface via `stackmcp` command
-
 ### OpenAPI Specifications
 
 All tool definitions are generated from OpenAPI specs in `stackone_ai/oas/`:

examples/mcp_server.py

@@ -35,8 +35,3 @@ docs-serve:
 docs-build:
 	uv run scripts/build_docs.py
 	uv run mkdocs build
-
-# Run MCP server inspector for debugging
-mcp-inspector:
-	uv sync --all-extras
-	npx @modelcontextprotocol/inspector stackmcp

justfile

@@ -29,9 +29,6 @@ dependencies = [
     "eval-type-backport; python_version<'3.10'",  # TODO: Remove when Python 3.9 support is dropped
 ]
 
-[project.scripts]
-stackmcp = "stackone_ai.server:cli"
-
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
@@ -48,7 +45,7 @@ packages = ["stackone_ai"]
 [project.optional-dependencies]
 # TODO: Remove python_version conditions when Python 3.9 support is dropped
 mcp = [
-    "mcp[cli]>=1.3.0; python_version>='3.10'",
+    "mcp>=1.3.0; python_version>='3.10'",
 ]
 examples = [
     "crewai>=0.102.0; python_version>='3.10'",