[YPARK]

What

• legume-mcp goes from "0.3" to "0.4", for both the dependency and the dev-dependency. With 0.10.1, a tool already on legume-mcp 0.4 carried two copies of it.
• When data-beans picks an output name itself (in today's results folder), it now skips any name a running job is writing, however the path is spelled. It does this through Call::ensure_free, on top of the claims data-beans already keeps. A name the agent gives is still refused while a job writes it, both by run_making/spawn_job and by the claim.
• Version 0.10.2: a patch. Only the MCP server changes; there is no CLI or library change.

Checks

• cargo fmt --check and cargo clippy --all-targets --features sim are clean.
• cargo test --features sim passes, with legume-mcp 0.4.0 and legume-tui 0.3.14.
• tests/detach_session.rs failed 0 of 10 runs, and 0 of 15 on legume-tui 0.3.13. Earlier, one test (a_kill_before_the_explorer_lets_its_output_file_finish) failed once while another crate was building at the same time. It waits a fixed 1 s, so heavy load can trip it.
• Review: checked against MCP write tools in the background; legume-mcp 0.3; version 0.10.1 #40's review findings and the design settled there. This diff only adds the ensure_free check where a name is picked.