fix: restore Python 3.10/3.11 support and report MCP version

- Drop backslash from f-string expression in markdown/html.py
- That syntax needs 3.12+ (PEP 701) and broke import on 3.10/3.11
- Add Python matrix 3.10/3.12/3.14/3.15 to the Gitea testing workflow
- Pass project_version() to MCPServer; serverInfo.version was empty
- Cover the reported version with an in-memory MCP client test
- Swap deprecated click.get_text_stream for sys.stdin.isatty()
- Add explicit encoding to native host shim and manifest writes
- Add explicit encoding to the registry lock file open
- Add explicit encoding to every read_text/write_text call in tests
- Bump version to 0.16.10 in pyproject.toml and extension/manifest.json
- Move .python-version to 3.15 and refresh uv.lock

Extension code is unchanged; only the manifest version string moved.

Verified with 778 tests on 3.10 through 3.15, plus a strict run using -X warn_default_encoding with EncodingWarning and DeprecationWarning as errors.

browser_cli/mcp/server.py

@@ -18,6 +18,7 @@ from browser_cli.mcp.naming import resolve_tool_prefix, tool_name
 from browser_cli.mcp.serialization import structured
 from browser_cli.mcp.targets import resolve_tab_id
 from browser_cli.url_match import find_reusable_tab, needs_navigation, tab_id as read_tab_id, tab_url
+from browser_cli.version_manager import project_version
 
 ClientFactory = Callable[..., BrowserCLI]
 
@@ -70,6 +71,7 @@ def create_server(*, client_factory: ClientFactory = BrowserCLI, tool_prefix: st
     "browser-cli",
     description="Control a real running browser through the browser-cli SDK.",
     instructions=_SERVER_INSTRUCTIONS,
+    version=project_version(),
   )
 
   @mcp.tool(name=tool_name("tabs_list", prefix))