feat: let agents read supervisor story graphs

Expose saved decisions, timelines and source evidence through read-only Story Graph tools across Model, Harness and local/remote OpenCode and Continue. Supervisor enablement and runtime assignments govern discovery and calls; reads do not invoke models or modify stored evidence. Remote use requires matching Desktop and Agent changes.

Make Continue discussion show the complete editable message with a separated destination and shared action layout. Sending uses the visible draft without reattaching removed context.

Validation: existing focused MCP, runtime, controlled Linux Host, discussion component and Electron layout checks plus typechecks; staged diff check passed. Cross-scope fact reuse, historical reconstruction and full package acceptance remain deferred.

Release note: Agents can consult saved supervisor decisions and their sources when continuing work. Continue discussion now lets you review and edit the complete message before sending.

src/shared/remote-image-tool-contracts.ts

@@ -5,21 +5,27 @@ import { imageOperationSchema, imageToolDescriptionLimit, imageToolInputSchema }
 export const remoteImageToolSchema = z.object({
   channelId: agentIdentifierSchema,
   channelEpoch: positiveAgentSequenceSchema,
-  description: z.string().min(1).max(imageToolDescriptionLimit)
+  description: z.string().min(1).max(imageToolDescriptionLimit).optional(),
+  storyGraph: z.boolean().optional()
 }).strict()
 
-export const remoteImageToolCallSchema = z.object({
+export const remoteImageToolCallSchema = z.union([z.object({
   callId: z.string().uuid(),
   input: imageToolInputSchema
-}).strict()
+}).strict(), z.object({
+  callId: z.string().uuid(),
+  name: z.enum(['story_graph_list', 'story_graph_search', 'story_graph_get_context', 'story_graph_read_source']),
+  input: z.record(z.string(), z.unknown())
+}).strict()])
 
 export const remoteImageToolReplySchema = z.object({
   callId: z.string().uuid(),
   result: imageOperationSchema.optional(),
+  storyGraphResult: z.record(z.string(), z.unknown()).optional(),
   error: z.string().max(4_000).optional()
 }).strict()
 
-// References and operation metadata only. Image bytes never cross this channel.
+// Bounded graph evidence or image-operation metadata. Image bytes never cross this channel.
 export const remoteImageToolMaximumBytes = 256 * 1024
 
 export function encodeRemoteImageToolMessage(value: unknown): Uint8Array {