feat(hooks): add agentId support to webhook mappings (#13672)

* feat(hooks): add agentId support to webhook mappings

Allow webhook mappings to route hook runs to a specific agent via
the new `agentId` field. This enables lightweight agents with minimal
bootstrap files to handle webhooks, reducing token cost per hook run.

The agentId is threaded through:
- HookMappingConfig (config type + zod schema)
- HookMappingResolved + HookAction (mapping types)
- normalizeHookMapping + buildActionFromMapping (mapping logic)
- mergeAction (transform override support)
- HookAgentPayload + normalizeAgentPayload (direct /hooks/agent endpoint)
- dispatchAgentHook → CronJob.agentId (server dispatch)

The existing runCronIsolatedAgentTurn already supports agentId on
CronJob — this change simply wires it through from webhook mappings.

Usage in config:
  hooks.mappings[].agentId = "my-agent"

Usage via POST /hooks/agent:
  { "message": "...", "agentId": "my-agent" }

Includes tests for mapping passthrough and payload normalization.
Includes doc updates for webhook.md.

* fix(hooks): enforce webhook agent routing policy + docs/changelog updates (#13672) (thanks @BillChirico)

* fix(hooks): harden explicit agent allowlist semantics (#13672) (thanks @BillChirico)

---------

Co-authored-by: Pip <pip@openclaw.ai>
Co-authored-by: Gustavo Madeira Santana <gumadeiras@gmail.com>

src/config/zod-schema.ts

@@ -301,6 +301,7 @@ export const OpenClawSchema = z
         enabled: z.boolean().optional(),
         path: z.string().optional(),
         token: z.string().optional(),
+        allowedAgentIds: z.array(z.string()).optional(),
         maxBodyBytes: z.number().int().positive().optional(),
         presets: z.array(z.string()).optional(),
         transformsDir: z.string().optional(),