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/capability-contracts.ts

@@ -36,6 +36,7 @@ export type CapabilityAssignments = z.infer<
 >
 
 export const builtinMcpServerIdSchema = z.enum([
+  'story-graph',
   'knowledge-base',
   'magic-notes',
   'goodbuddy-config',
@@ -62,17 +63,19 @@ export const builtinMcpServerToggleInputSchema = z
 export const builtinMcpServerAssignmentsInputSchema = z
   .object({
     serverId: builtinMcpServerIdSchema,
-    assignments: builtinMcpAssignmentsSchema
+    assignments: capabilityAssignmentsSchema
   })
   .strict()
+  .refine(value => value.serverId === 'story-graph' || !value.assignments.includes('deepseek-harness'), 'DeepSeek Harness only supports the Story Graph built-in MCP')
 
 export const builtinMcpServerStateSummarySchema = z
   .object({
     id: builtinMcpServerIdSchema,
     enabled: z.boolean(),
-    assignments: builtinMcpAssignmentsSchema
+    assignments: capabilityAssignmentsSchema
   })
   .strict()
+  .refine(value => value.id === 'story-graph' || !value.assignments.includes('deepseek-harness'), 'DeepSeek Harness only supports the Story Graph built-in MCP')
 export type BuiltinMcpServerStateSummary = z.infer<
   typeof builtinMcpServerStateSummarySchema
 >
@@ -396,7 +399,7 @@ export const capabilitySnapshotSchema = z
       .optional(),
     builtinMcpServers: z
       .array(builtinMcpServerStateSummarySchema)
-      .max(5)
+      .max(6)
       .optional(),
     obsidian: obsidianSettingsSchema.default({ vaultPath: '' }),
     mcpServers: z.array(mcpServerSummarySchema).max(64),