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.

tests/test_mcp.py

@@ -15,6 +15,7 @@ from browser_cli.mcp.serialization import structured
 from browser_cli.mcp.naming import resolve_tool_prefix
 from browser_cli.mcp.server import _screenshot_bytes, create_server, main
 from browser_cli.models import Tab
+from browser_cli.version_manager import project_version
 
 class FakeClient:
   instances: list["FakeClient"] = []
@@ -147,6 +148,15 @@ async def test_environment_pins_all_calls_to_one_browser(client, monkeypatch):
 
   assert FakeClient.instances[-1].target == ("testing", None, None)
 
+@pytest.mark.anyio
+async def test_server_reports_the_project_version_to_clients(client):
+  info = client.server_info
+
+  assert info is not None
+  assert info.name == "browser-cli"
+  assert info.version == project_version()
+  assert info.version not in ("", "unknown")
+
 def test_tool_prefix_defaults_to_browser_and_is_configurable():
   assert resolve_tool_prefix({}) == "browser_"
   assert resolve_tool_prefix({"BROWSER_CLI_MCP_TOOL_PREFIX": ""}) == ""