fix(mcp): report our own version in the MCP handshake

[junzh0u]

Follow-up to #242.

MCPServer's version parameter defaults to "" and create_mcp_server never passed one, so the handshake advertises an empty serverInfo.version — Claude Code's /mcp and MCP Inspector show nothing.

This predates #242: v1's FastMCP took no version argument and filled the field with the SDK's own release, so the handshake reported 1.29.0. #242 turned a wrong value into an empty one; this reports the right one.

It now passes _version.__version__ — the same value ccc version prints (#245) and the daemon handshake compares against — so it can't drift. Single MCPServer(...) call site, so ccc mcp and the legacy cocoindex-code entry point both pick it up.

Try it

$ uv run python -c "
import asyncio
from mcp import Client
from cocoindex_code.server import create_mcp_server
async def m():
    async with Client(create_mcp_server('.')) as c: print(repr(c.server_info.version))
asyncio.run(m())"

''                          # main @ 1a56d0f
'0.2.40.dev7+gc51a93e78'    # this branch, matching `ccc version`

test_mcp_server_reports_own_version asserts the handshake value equals __version__.

Operational impact

None — handshake metadata only. No protocol, settings, or on-disk change; no migration.

🤖 Generated with Claude Code