Merge remote-tracking branch 'origin/master' into xtr/react-loop-simplification

# Conflicts:
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/session.i18n.yaml
#	docs/persistence-catalog.md
#	packages/cordis/tool-cordis/src/api-catalog.ts

packages/core/session/tests/fork.spec.ts

@@ -7,6 +7,8 @@ import type { SessionEvent, TurnEndReason } from '@deepseek-ai/dsh-session'
 declare module '@deepseek-ai/dsh-session' {
   interface SessionEventMap {
     'test/log-only': { value: string }
+    /** Stands in for a plugin's open/close bracket (`compact/start`). */
+    'test/bracket-open': { id: string }
   }
 }
 
@@ -50,6 +52,14 @@ function lastSeq(session: Session): number {
   return event.seq
 }
 
+/** A seeded child's constructor seed: its log minus the end-seed marker. */
+function inherited(session: Session): readonly SessionEvent[] {
+  const events = session.events
+  const last = events.at(-1)
+  if (last?.type !== 'session/end-seed') throw new Error('seeded child is missing its end-seed marker')
+  return events.slice(0, -1)
+}
+
 describe('SessionStore.fork', () => {
   it('forks an empty live session as an empty child with lineage metadata', async () => {
     const { ctx, sessions } = await setup()
@@ -73,7 +83,7 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(SessionId('parent'), undefined, SessionId('child'))
 
-    expect(child.events).toEqual(source.events)
+    expect(inherited(child)).toEqual(source.events)
     expect(child.events).not.toBe(source.events)
     expect(child.events[1]).not.toBe(source.events[1])
     expect(() => {
@@ -97,8 +107,8 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(source, undefined, SessionId('log-only-child'))
 
-    expect(child.events).toEqual(source.events)
-    expect(child.events.at(-1)).toMatchObject({
+    expect(inherited(child)).toEqual(source.events)
+    expect(inherited(child).at(-1)).toMatchObject({
       type: 'test/log-only',
       data: { value: 'after execution' },
     })
@@ -114,7 +124,7 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(source, firstBoundary, SessionId('child-from-first'))
 
-    expect(child.events).toEqual(source.events.slice(0, firstBoundary + 1))
+    expect(inherited(child)).toEqual(source.events.slice(0, firstBoundary + 1))
     expect(child.header.seedLength).toBe(firstBoundary + 1)
     expect(child.deriveMessages()).toEqual([{
       id: expect.any(String) as unknown,
@@ -141,11 +151,32 @@ describe('SessionStore.fork', () => {
 
       const child = sessions.fork(source, lastSeq(source), SessionId(`child-${reason.kind}`))
 
-      expect(child.events.at(-1)?.type).toBe('turn/end')
+      expect(inherited(child).at(-1)?.type).toBe('turn/end')
       expect(child.header.seedLength).toBe(source.events.length)
     }
   })
 
+  it('marks a bracket the child inherited from a still-running parent', async () => {
+    // The constructor placement's central claim, unreachable from the
+    // persistence load path.
+    const { ctx, sessions } = await setup()
+    const parent = ctx.sessions.create(SessionId('bracket-parent'), { meta: { cwd: '/workspace' } })
+    appendClosedTurn(parent, 1, 'work')
+    const open = parent.append('test/bracket-open', { id: 'op-1' })
+
+    const child = sessions.fork(parent, undefined, SessionId('bracket-child'))
+
+    // Parent: no end-seed event follows the bracket, so its owner treats it as live.
+    expect(parent.events.at(-1)).toBe(open)
+    expect(parent.events.some(event => event.type === 'session/end-seed')).toBe(false)
+    // Child: the same bracket is before end-seed, so it belongs to the seed.
+    const boundary = child.events.at(-1)
+    expect(boundary).toMatchObject({ type: 'session/end-seed' })
+    expect(boundary!.seq).toBeGreaterThan(open.seq)
+    expect(child.firstLiveSeq).toBe(open.seq + 1)
+    expect(inherited(child).at(-1)).toMatchObject({ type: 'test/bracket-open', data: { id: 'op-1' } })
+  })
+
   it('rejects invalid boundaries before creating a child', async () => {
     const { ctx, sessions } = await setup()
     const empty = ctx.sessions.create(SessionId('empty'))