feat(session-query): checkpoint build round 1

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

@@ -350,6 +350,43 @@ describe('SessionStore', () => {
     expect(observed).toBe(0)
   })
 
+  it('announces a cloned header only after the session leaves the store', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SessionStore)
+    const observations: Array<{ id: string; live: boolean }> = []
+    ctx.on('session/removed', (header) => {
+      observations.push({ id: header.id, live: ctx.sessions.get(header.id) !== undefined })
+      header.createdAt = -1
+    })
+    const session = ctx.sessions.prepare(SessionId('removed'), { meta: { createdAt: 7 } })
+    const detach = ctx.sessions.enter(session)
+
+    detach()
+    await Promise.resolve()
+    await Promise.resolve()
+
+    expect(observations).toEqual([{ id: 'removed', live: false }])
+    expect(session.header.createdAt).toBe(7)
+    // A repeated disposer cannot remove or announce a later same-id owner.
+    const replacement = ctx.sessions.create(SessionId('removed'))
+    detach()
+    expect(ctx.sessions.get(replacement.id)).toBe(replacement)
+    expect(observations).toHaveLength(1)
+  })
+
+  it('contains rejected session/removed listeners during teardown', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SessionStore)
+    ctx.on('session/removed', () => Promise.reject(new Error('observer failed')))
+    const session = ctx.sessions.prepare(SessionId('contained'))
+    const detach = ctx.sessions.enter(session)
+
+    expect(detach).not.toThrow()
+    await Promise.resolve()
+    await Promise.resolve()
+    expect(ctx.sessions.get(session.id)).toBeUndefined()
+  })
+
   it('rolls back the session (and onAppend) when a session/created listener throws (P1-1)', async () => {
     const ctx = new Context()
     await ctx.plugin(SessionStore)