fix(session): add semantic crash checkpoints

packages/examples/tui-demo/package.json

@@ -41,6 +41,7 @@
     "@deepseek-ai/dsh-agent-spine-demo": "^0.0.1",
     "@deepseek-ai/dsh-workspace-context": "^0.0.1",
     "@deepseek-ai/dsh-session": "^0.0.1",
+    "@deepseek-ai/dsh-session-checkpoint-policy": "^0.0.1",
     "@deepseek-ai/dsh-session-persistence-jsonl": "^0.0.1",
     "@deepseek-ai/dsh-tui": "^0.0.1",
     "@deepseek-ai/dsh-tool-ask-user": "^0.0.1",
@@ -62,6 +63,7 @@
     "@deepseek-ai/dsh-system-prompt": "workspace:^",
     "@deepseek-ai/dsh-workspace-context": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-session-checkpoint-policy": "workspace:^",
     "@deepseek-ai/dsh-session-persistence-jsonl": "workspace:^",
     "@deepseek-ai/dsh-tui": "workspace:^",
     "@deepseek-ai/dsh-tool-ask-user": "workspace:^",

packages/examples/tui-demo/src/index.ts

@@ -21,6 +21,7 @@ import SessionPersistenceJsonl, {
   JsonlCompressionSchema,
   type JsonlCompression,
 } from '@deepseek-ai/dsh-session-persistence-jsonl'
+import * as sessionCheckpointPolicy from '@deepseek-ai/dsh-session-checkpoint-policy'
 import UserInteractionService from '@deepseek-ai/dsh-user-interaction'
 import * as toolAskUser from '@deepseek-ai/dsh-tool-ask-user'
 import * as uiTui from '@deepseek-ai/dsh-tui'
@@ -109,6 +110,7 @@ export function composeTuiApp(ctx: Context, config: Config): void {
     root: config.persistenceRoot ?? DEFAULT_PERSISTENCE_ROOT,
     ...(config.persistenceCompression === undefined ? {} : { compression: config.persistenceCompression }),
   })
+  ctx.plugin(sessionCheckpointPolicy)
   ctx.plugin(UserInteractionService)
   ctx.plugin(uiTui, {
     ...config.ui,

packages/examples/tui-demo/tests/tui-agent.spec.ts

@@ -44,6 +44,7 @@ describe('dsh-tui-demo app', () => {
       'CommandService',
       'command-goal',
       'SessionPersistenceJsonl',
+      'session-checkpoint-policy',
       'UserInteractionService',
       'ui-tui',
       'agent-spine-demo',
@@ -51,10 +52,10 @@ describe('dsh-tui-demo app', () => {
     ])
     expect(calls[0]?.config).toBeUndefined()
     expect(calls[2]?.config).toEqual({ root: '/tmp/tui-sessions', compression: 'none' })
-    const tuiConfig = calls[4]?.config as { sessionId: string }
+    const tuiConfig = calls[5]?.config as { sessionId: string }
     expect(tuiConfig).toMatchObject({ welcome: 'TUI ready', color: false, maxToolOutputLines: 3 })
     expect(tuiConfig.sessionId).toMatch(/^main-session-[0-9a-f-]{36}$/)
-    const spineConfig = calls[5]?.config as {
+    const spineConfig = calls[6]?.config as {
       readonly agents: Array<Record<string, unknown>>
       readonly goals: Record<string, never>
       readonly maxParallelToolCalls: number
@@ -88,8 +89,8 @@ describe('dsh-tui-demo app', () => {
     })
 
     expect(calls[2]?.config).toEqual({ root: './.sessions' })
-    expect(calls[4]?.config).toEqual({ welcome: 'ready.', sessionId: 'persisted-session' })
-    expect((calls[5]?.config as { agents: Array<Record<string, unknown>> }).agents[0]).toMatchObject({
+    expect(calls[5]?.config).toEqual({ welcome: 'ready.', sessionId: 'persisted-session' })
+    expect((calls[6]?.config as { agents: Array<Record<string, unknown>> }).agents[0]).toMatchObject({
       id: 'main',
       resumeSessionId: 'persisted-session',
     })
@@ -105,12 +106,12 @@ describe('dsh-tui-demo app', () => {
       workspaceContext: false,
     })
 
-    const tuiConfig = calls[3]?.config as { sessionId: string }
+    const tuiConfig = calls[4]?.config as { sessionId: string }
     expect(tuiConfig.sessionId).toMatch(/^main-session-[0-9a-f-]{36}$/)
-    expect((calls[4]?.config as { agents: Array<Record<string, unknown>> }).agents[0])
+    expect((calls[5]?.config as { agents: Array<Record<string, unknown>> }).agents[0])
       .toMatchObject({ sessionId: tuiConfig.sessionId })
     expect(calls.map(call => call.name)).not.toContain('command-goal')
-    expect(calls[4]?.config).toMatchObject({ goals: false })
+    expect(calls[5]?.config).toMatchObject({ goals: false })
   })
 
   it('has the namespace-plugin export shape so the Loader keeps its schema', () => {

packages/examples/tui-demo/tsconfig.json

@@ -47,6 +47,9 @@
     {
       "path": "../../ui/tool-ask-user"
     },
+    {
+      "path": "../../session-persistence/session-checkpoint-policy"
+    },
     {
       "path": "../../session-persistence/session-persistence-jsonl"
     }