fix(agents): correct CHANGELOG structure and parent epic reference in pool supervisor

Consolidate duplicate ### Fixed sub-headers under [Unreleased] section
in CHANGELOG.md into a single section per Keep a Changelog format.
Add all pre-existing entries under one ### Fixed header for cleanliness.

Replace incorrect Parent Epic: #9779 (an automated announcement post)
with placeholder in implementation-pool-supervisor agent definition
examples, since #9779 is not an Epic.

.opencode/agents/implementation-pool-supervisor.md

@@ -164,7 +164,8 @@ all 8 items before creating a PR: CHANGELOG.md update, CONTRIBUTORS.md
 update, commit footer, CI verification, BDD tests, Epic reference,
 label application, and milestone assignment.
 
-Parent Epic: #9779
+<!-- TODO: Replace <EPIC-NUMBER> with correct parent Epic for implementation-supervisor improvements -->
+Parent Epic: #<EPIC-NUMBER>
 
 ISSUES CLOSED: #10069
 ```

CHANGELOG.md

@@ -88,14 +88,6 @@ Changed `wf10_batch.robot` to be less likely to create files, and
 
 - **A2A module rename BDD test suite** (#8615): Comprehensive Behave tests validating that the ACP→A2A module rename is complete — verifying all 22 A2A symbols are properly exported, no legacy ACP references remain in `.py` files under `cleveragents.a2a/`, and the module docstring uses current A2A naming. The step definitions include self-contained symbol lookups to avoid cross-scenario dependency failures.
 
-- Fixed `ReactiveEventBus.emit()` exception handler to log the full exception
-  message (`str(exc)`) and enable traceback forwarding (`exc_info=True`).
-  Previously the handler logged only the exception type name (e.g.
-  "ValueError") with no diagnostic detail, making production debugging
-  impossible. The handler now includes the error message text and full
-  traceback in the structlog warning entry. Removed `@tdd_expected_fail` tag
-  from the TDD test so both scenarios run as normal regression guards. (#988)
-
 ### Added
 
 - **`pr-review-worker` review-started notification** (#11028): The `first_review`
@@ -170,6 +162,8 @@ Changed `wf10_batch.robot` to be less likely to create files, and
 
 - **YAML frontmatter fields added to `implementation-pool-supervisor` agent definition** (#10069): Added `model: "CleverThis-8/Qwen3-Coder-Next-GGUF-Q6-K"` and `reasoningEffort: "high"` to the YAML frontmatter, matching the convention used by other supervisor agents (`implementation-supervisor.md`, `pr-merge-supervisor.md`).
 
+
+- **ReactiveEventBus.emit() exception handler** (#988): Fixed the exception handler to log the full exception message (`str(exc)`) and enable traceback forwarding (`exc_info=True`). Previously the handler logged only the exception type name (e.g. "ValueError") with no diagnostic detail. The handler now includes the error message text and full traceback in the structlog warning entry. Removed `@tdd_expected_fail` tag from the TDD test so both scenarios run as normal regression guards.
 - **Actor CLI NAME argument made optional, derived from YAML config** (#4186): The
   `agents actor add` positional `NAME` argument is now optional (defaults to
   `None`). When omitted, the actor name is derived from the `name` field in