hive-subagent-mcp: new crate for the subagent daemon, independent of hive-bash-mcp

hive-subagent-mcp/README.md

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+# hive-subagent-mcp
+
+Per-agent daemon (`hive-subagent-daemon`) that spawns nested headless
+`claude` sessions on request and serves the tool surface
+(`start`/`continue`/`interrupt`) directly over streamable-http. No
+stdio bridge, no per-turn respawn — claude reconnects to the same
+stable URL every turn.
+
+Independent of `hive-bash-mcp` — a subagent spawns a full nested
+`claude` session, a much heavier capability than a bash command, worth
+its own deployable/restartable unit.
+
+## Shape
+
+One bin (`hive-subagent-daemon`, `src/main.rs`) built from the crate's
+own lib (`src/lib.rs`):
+
+- **`session.rs`** — the actual claude-facing logic: `Claude::spawn` +
+  `RunningClaude::wait`/`cancel_handle` (not `InfiniteSession::run`,
+  which has no cancel handle to reach in — see the module doc for the
+  v1 scope this trades away), the in-memory `running` map that's the
+  _only_ state this daemon keeps (no task files — a restart stops
+  whatever's running; the actual claude session is the durable store,
+  found again by name via `hive_claude::SessionStore`).
+- **`mcp.rs`** — the `rmcp` tool router (`start`/`continue`/`interrupt`)
+  - `serve_http`.
+- **`paths.rs`** — the in-agent todo-socket path.