feat: add SSE transport support and refactor CLI arg parsing

[SlackJaw74]

Add SSE (Server-Sent Events) transport option to the MCP server, allowing a single shared instance to serve multiple MCP host clients over HTTP.

• Add --transport, --port, and --host CLI arguments
• Extract build_arg_parser() so tests validate the real CLI contract
• Update README with SSE server setup and MCP host configuration examples
• Update uv.lock

[Copilot]

Pull request overview

Adds an SSE (Server-Sent Events) transport option for running code-memory as a shared MCP server over HTTP, and refactors CLI parsing so tests can validate the actual CLI contract.

Changes:

• Added --transport, --host, and --port CLI arguments and wired them into main() to select stdio vs SSE.
• Introduced build_arg_parser() and added new tests to validate CLI defaults/flags and main() behavior.
• Expanded README with shared SSE server setup instructions and MCP host configuration examples (plus dependency lockfile updates).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
server.py	Adds build_arg_parser() and uses parsed args to configure/run the MCP server with stdio vs SSE.
tests/test_main.py	New tests for CLI parsing defaults/flags and verifying main() passes the right transport/settings to mcp.
README.md	Documents shared SSE mode usage and adds a CLI options table; also updates dev instructions.
uv.lock	Updates locked dependency graph/version metadata for the release and environment.

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[Copilot]

The development code block is malformed: uv build# Clone the repo concatenates two commands, and the subsequent clone/install/run instructions duplicate the existing “From Source” section earlier in the README. This breaks the rendered docs and makes the quickstart instructions confusing; split uv build onto its own line and move/remove the duplicated clone/setup steps (keep each set of instructions in one place).

Suggested change

	uv build# Clone the repo
	git clone https://github.com/kapillamba4/code-memory.git
	cd code-memory
	# Install dependencies
	uv sync
	# Run the MCP server (stdio transport)
	uv run mcp run server.py
	# Run the MCP server (SSE transport for shared usage)
	uv run python server.py --transport sse
	uv build

[Copilot]

from server import build_arg_parser imports server.py at test module import time. Since server.py imports db.py, which imports sqlite_vec at module import time, these arg-parsing tests will error (not skip) in environments where sqlite_vec isn't installed. To make the tests robust, either import server lazily inside the tests after pytest.importorskip(...), or move build_arg_parser() into a lightweight module that doesn’t import the full server stack.

Suggested change

	from server import build_arg_parser
	class TestMainArgParsing:
	"""Tests for CLI argument parsing in main()."""
	def _parse_args(self, argv: list[str]) -> argparse.Namespace:
	"""Parse args using the real CLI parser from server.py."""
	class TestMainArgParsing:
	"""Tests for CLI argument parsing in main()."""
	def _parse_args(self, argv: list[str]) -> argparse.Namespace:
	"""Parse args using the real CLI parser from server.py."""
	pytest.importorskip("sqlite_vec", reason="sqlite_vec not installed")
	from server import build_arg_parser

[SlackJaw74]

@copilot open a new pull request to apply changes based on the comments in this thread