Release 0.1.8

[xtrusia]

Summary

• stop OSD and client tracers when their controlling SSH connection closes
• remove matching tracer runners left by an interrupted earlier session before starting a new tracer
• validate PID ownership and process start time before sending cleanup signals
• release the change as 0.1.8

Root cause

The remote runner relied on shell signal traps, but terminating the local controller did not reliably deliver a usable HUP to the remote shell. The runner and its privileged tracer descendants could therefore outlive the TUI until TTL expiry.

Validation

• cargo fmt --all --check
• cargo clippy --all-targets -- -D warnings
• cargo build --verbose
• cargo test --verbose
• forced controller termination against a four-node cluster
• forced kfstrace and radostrace termination
• cleanup of a runner deliberately left by v0.1.7