docs: teach the graph generator the CHAINED fused-dispatch spelling

ds-review-bot round-3 finding: agentEvents(ctx, agent).emit(...) has a
call-expression receiver the generator's identifier check missed, silently
dropping agent-loop as agent/session-start's producer. The generator now
recognizes a call receiver whose callee is agentEvents; graph regenerated
with the producer edge restored.

docs/event-producer-consumer.md

@@ -14,7 +14,7 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `agent/prompt-submit` | `waterfall` | [`packages/core/agent/src/types.ts:414`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
 | `agent/queued` | `emit` | [`packages/core/agent/src/types.ts:326`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
 | `agent/request` | `waterfall` | [`packages/core/agent/src/types.ts:442`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
-| `agent/session-start` | `emit` | [`packages/core/agent/src/types.ts:346`](../packages/core/agent/src/types.ts) | - | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`invariants`](../packages/support/invariants) |
+| `agent/session-start` | `emit` | [`packages/core/agent/src/types.ts:346`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`invariants`](../packages/support/invariants) |
 | `agent/status` | `emit` | [`packages/core/agent/src/types.ts:312`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`acp`](../packages/ui/acp), [`invariants`](../packages/support/invariants), [`stdio-agent`](../packages/ui/stdio-agent) |
 | `agent/step-result` | `waterfall` | [`packages/core/agent/src/types.ts:457`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
 | `agent/turn-continuation` | `waterfall` | [`packages/core/agent/src/types.ts:475`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |

scripts/gen-doc-graphs.ts

@@ -519,6 +519,11 @@ function collectEventRelations(): Map<string, EventRelation> {
 }
 
 function isCordisContextReceiver(expr: ts.PropertyAccessExpression, sf: ts.SourceFile): boolean {
+  // The chained fused-dispatch spelling: `agentEvents(ctx, agent).emit(…)` —
+  // the receiver is a call expression, not an identifier.
+  if (ts.isCallExpression(expr.expression) && expr.expression.expression.getText(sf) === 'agentEvents') {
+    return true
+  }
   const target = expr.expression.getText(sf)
   if (target === 'ctx' || target === 'this.ctx') return true
   // Scoped-dispatch spellings (the agent-scoping seam): the loop's fused