refactor(session): route construction through Session.create

packages/compact/compact-tool-result-prune/tests/tool-result-prune.spec.ts

@@ -153,7 +153,7 @@ describe('ToolResultPruneService content transform', () => {
 
 describe('ToolResultPruneService session transaction', () => {
   it('prunes a stable snapshot, preserves all data, and records provenance', () => {
-    const session = new Session(SessionId('preserve'))
+    const session = Session.create(SessionId('preserve'))
     const originalSeq = appendToolStep(session, 1, 'one', [{
       type: 'text',
       text: 'x'.repeat(100),
@@ -208,7 +208,7 @@ describe('ToolResultPruneService session transaction', () => {
   })
 
   it('prunes multiple results, skips short ones, and converges in one pass', () => {
-    const session = new Session(SessionId('multiple'))
+    const session = Session.create(SessionId('multiple'))
     appendToolStep(session, 1, 'a', [{ type: 'text', text: 'A'.repeat(100) }])
     appendToolStep(session, 2, 'b', [{ type: 'text', text: 'short' }])
     appendToolStep(session, 3, 'c', [{ type: 'text', text: 'C'.repeat(80) }])
@@ -227,14 +227,14 @@ describe('ToolResultPruneService session transaction', () => {
   })
 
   it('replays to the identical pruned model messages', () => {
-    const session = new Session(SessionId('replay'))
+    const session = Session.create(SessionId('replay'))
     appendToolStep(session, 1, 'a', [{ type: 'text', text: 'A'.repeat(100) }])
     session.append('turn/start', {
       turn: 2,
       trigger: { kind: 'message', source: { kind: 'user' } },
     })
     service().pruneSession(session)
-    const replay = new Session(session.id, [...session.events])
+    const replay = Session.create(session.id, [...session.events])
     expect(replay.deriveMessages()).toEqual(session.deriveMessages())
     expect(replay.surface.replaceGeneration).toBe(session.surface.replaceGeneration)
   })