docs(spec): add CHANGELOG entry for custom resource type YAML format fix (#5622)

CHANGELOG.md

@@ -941,6 +941,13 @@ Documentation Report (Cycle N)` issues every 10 cycles (~3.3 hours). The manager
 
 ### Fixed
 
+- **Custom resource type YAML format** (#5622): Corrected three inconsistent YAML format
+  examples in `docs/specification.md` to match the canonical format defined in
+  `docs/schema/resource_type.schema.yaml`. Field names updated: `resource_kind`,
+  `cli_args`, `parent_types`, `capabilities.read/write/sandbox/checkpoint`,
+  `handler: module:ClassName`, and `child_types` as flat string list. Added documentation
+  explaining per-child-type auto-discovery configuration in the `auto_discovery` block.
+
 - **Plan Concurrency Race Condition** (#7989): Fixed critical race condition in `execute_plan()` and
   `apply_plan()` where concurrent CLI/worker sessions could simultaneously modify the same plan,
   corrupting plan state. `LockService` is now wired into the plan lifecycle with plan-level advisory
@@ -1092,4 +1099,4 @@ iteration` and data corruption under concurrent plan execution. All public
 - **TUI -- Permission Question Widget**: A new inline `PermissionQuestionWidget`
   renders permission requests directly in the conversation stream for single-file
   operations. Users can allow/reject with single-key shortcuts (`a`/`A`/`r`/`R`),
-  navigate with arrow keys, confirm with `Enter`, or press `v` to open the full
+  navigate with arrow keys, confirm with `Enter`, or press `v` to open the full