v0.1.0: session tools for the sessions you have open

First release. Six model-facing tools over DeepSeek Harness top-level sessions:

• thread_list — enumerate sessions with id, title, cwd, and liveness
• thread_search — full-text search across session content
• thread_send — deliver a message to a live session
• thread_reply — read that session's newest answer, after waiting if you ask it to
• thread_create — open a fresh session, inheriting the caller's model route
• thread_fork — branch a session at its last completed turn

Verified with 24 checks against a real profile's session store, including a
model-driven turn (scripted LLM adapter, no API key) that lists a session,
messages it, and reads the reply.

Install: dsh plugin --profile web add github:wig123/dsh-thread-tools