docs: add AgentOutputLineData to codebase map event type list

The event type list in the event system section was missing
AgentOutputLineData, which powers live peek for all agents. This
was added alongside the AGENT_OUTPUT_LINE event but only documented
in the API reference and the peek section below — contributors
looking at the type list would miss it.

Co-authored-by: Ralphify <noreply@ralphify.co>

Author: 2 people

docs/contributing/codebase-map.md

@@ -84,7 +84,8 @@ Event data uses TypedDict classes — one per event type — rather than free-fo
 - **`IterationStartedData`** / **`IterationEndedData`** — per-iteration data (return code, duration, log path)
 - **`CommandsStartedData`** / **`CommandsCompletedData`** — command execution bookends
 - **`PromptAssembledData`** — prompt length after placeholder resolution
-- **`AgentActivityData`** — streaming agent output
+- **`AgentActivityData`** — streaming agent output (Claude Code only)
+- **`AgentOutputLineData`** — raw line of agent output from any agent (powers live peek)
 - **`LogMessageData`** — info/error messages with optional traceback
 
 All payload types are unioned as `EventData`.