Session replay over MCP

MCP lets an agent discover and call tools over a standard protocol. Glass exposes a remote MCP server so your agent can query production data without any custom glue.

The core tools are deliberately small: search_errors returns ranked groups, get_repro_path returns the ordered events leading to a failure, and get_screenshot renders a single frame on demand.

Because the CLI and MCP server share the same projection layer, `glass repro --json` and the get_repro_path tool return identical artifacts — one for humans and CI, one for agents.