Use built-in agent preset defaults

CHANGELOG.md

@@ -7,6 +7,12 @@ loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ## [Unreleased]
 
 ### Changed
+- Built-in agent presets (`claude`, `codex`, `opencode`) now live in
+  memory and user preset files merge over them by name instead of
+  patterm writing default preset files into `$XDG_CONFIG_HOME`. Add
+  `"disabled": true` in a matching user preset to hide a built-in.
+- Generated MCP config files for agent launches now live under the
+  runtime agent directory instead of `$XDG_CONFIG_HOME/patterm/mcp`.
 - Auto-summarization settings now save as soon as a changed row is
   applied, including cadence/provider/toggle changes and model edits,
   without requiring a separate save step.
@@ -21,6 +27,10 @@ loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   using an ellipsized single-line value.
 
 ### Fixed
+- Claude permission prompts are now detected from the rendered pane as
+  well as the recent output tail, so the sidebar marks the pane as
+  waiting for permission even while `Calling patterm...` continues to
+  repaint.
 - Removed the redundant "Back to Settings" row from the
   Agents / Auto-summarization settings screen.