docs: document get_host_journal in scheduling.md and turn-loop.md

docs/turn-loop.md

@@ -356,6 +356,11 @@ at_unix_timestamp?)`, `request_next_turn()`.
 - **Scheduling + diagnostics** (`scheduling`, `diagnostics`) —
   scheduled prompts, `get_logs`. See
   [`docs/tools/scheduling.md`](tools/scheduling.md).
+- **Capability-gated** — `get_host_journal` (requires
+  `read_host_journal` capability set via the P3RM1SS10NS tab;
+  orthogonal to tool groups). Full list of capabilities and their
+  effects in [`docs/conventions.md#capabilities`](../docs/conventions.md).
+  Also documented in [`docs/tools/scheduling.md`](tools/scheduling.md).
 - **Matrix MCP + extra servers** — `mcp__matrix__*` tools and
   per-agent extra MCP config. See
   [`docs/tools/matrix.md`](tools/matrix.md).