diff --git a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.i18n.yaml b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.i18n.yaml
index 7fd3cc3676..3dcffdc51a 100644
--- a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.md
-2026-09-01-v2-embedded-assistant-streams.md: 219879600f8435a6ecc9593661dd3f463ed1158c
-2026-09-01-v2-embedded-assistant-streams.zh.md: d38c180b1f1de689620f2e0533d2b02f4a71e466
+2026-09-01-v2-embedded-assistant-streams.md: 89b494959fcc10a2c9847908adcf13d5eedcd749
+2026-09-01-v2-embedded-assistant-streams.zh.md: 63cb425740cd2243361ec00a6dadad82c38f6f0f
diff --git a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.md b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.md
index 219879600f..89b494959f 100644
--- a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.md
+++ b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.md
@@ -31,7 +31,7 @@ The migration publication verifier and frozen v2 fixture validator require the e
 
 The Web follow adapter opts into these process-local frames and adds the last durable sequence observed at each start. It presents chunks as Client-only `assistant/live-chunk` updates between durable cursors, stages only a later matching settlement until the committed end, and reopens follow on a revision gap. A committed end publishes a named settlement delta that removes the attempt's transient matches, adds the durable entry, and replays only affected Conversation Contexts; an abandoned end publishes the same delta without an entry. A reconnect baseline carries the active attempt's durable start cursor and compact prefix.
 
-The Client event source passes durable settlements through unchanged. The Chat and Trajectory Assistant nodes fold `assistant/live-chunk` while an attempt is active, build settled output directly from `assistant/message`, and do not replay an `assistant/attempt` stream for presentation. Cold settled presentation therefore does not reconstruct per-token timing; other consumers may expand the durable stream when they require its exact evidence.
+The Client event source passes durable settlements through unchanged. Chat and Trajectory fold `assistant/live-chunk` while an attempt is active and build settled output directly from `assistant/message`. Chat does not reconstruct first-token timing after settlement retires the transient chunks. Trajectory reads timing from the [compact stream records](2026-09-06-embedded-stream-record-readers.md) in `assistant/message` and `assistant/attempt`, including when opening history. Neither target expands settled streams into per-delta objects for presentation; other consumers may expand the durable stream when they require its exact evidence.
 
 ### Released v1 to v2 migration
 
diff --git a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.zh.md b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.zh.md
index d38c180b1f..63cb425740 100644
--- a/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.zh.md
+++ b/.agents/notes/implemented/architecture/2026-09-01-v2-embedded-assistant-streams.zh.md
@@ -31,7 +31,7 @@ Migration publication verifier 与冻结的 v2 fixture validator 要求嵌入式
 
 Web follow adapter 显式选择接收这些进程本地 frame，并为每个 start 补充当时观察到的最后一个持久序号。它把 chunk 呈现为持久 cursor 之间的 Client-only `assistant/live-chunk` update，只暂存 start 之后匹配的 settlement，并在 revision 缺口时重新打开 follow。committed end 会发布具名 settlement delta，删除该 attempt 的 transient match、加入持久 entry，并只重放受影响的 Conversation Context；abandoned end 会发布不含 entry 的同类 delta。重连 baseline 携带活跃 attempt 的持久起始 cursor 与紧凑前缀。
 
-Client event source 原样传递持久 settlement。Chat 与 Trajectory 的 Assistant node 在 attempt 活跃期间折叠 `assistant/live-chunk`，直接从 `assistant/message` 构建 settled output，并且不为展示重放 `assistant/attempt` stream。因此冷恢复的 settled presentation 不会重建逐 token timing；其他消费方需要精确证据时仍可展开持久 stream。
+Client event source 原样传递持久 settlement。Chat 与 Trajectory 在 attempt 活跃时折叠 `assistant/live-chunk`，直接从 `assistant/message` 构造 settled output。结算移除临时 chunk 后，Chat 不会重建首 token 计时。Trajectory 从 `assistant/message` 与 `assistant/attempt` 中的[紧凑流记录](2026-09-06-embedded-stream-record-readers.zh.md)读取计时，包括打开历史时。两个目标都不会为展示将已结算流展开为逐 delta 对象；其他消费方需要精确证据时仍可展开持久 stream。
 
 ### 已发布 v1 到 v2 迁移
 
diff --git a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.i18n.yaml b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.i18n.yaml
index bf1b1774a7..d88fb31e2e 100644
--- a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.md
-2026-09-09-ptc-trajectory-code-inspection.md: 84fbc1334683fb70efc28c5cce312c0c75a81b2a
-2026-09-09-ptc-trajectory-code-inspection.zh.md: a0e82d6b4ac2f135d1fb685647e9b1a82cd8ce73
+2026-09-09-ptc-trajectory-code-inspection.md: 19779d20e8d08ce0ca9678ab6626765faa13cf65
+2026-09-09-ptc-trajectory-code-inspection.zh.md: 7cdb2321d61893e43426798d311847662450d289
diff --git a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.md b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.md
index 84fbc13346..19779d20e8 100644
--- a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.md
+++ b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.md
@@ -16,6 +16,8 @@ The result view preserves recorded text and uses a tree only for complete JSON o
 
 The [PTC runtime decision](2026-06-15-ptc.md) still owns execution and settlement; the [client presentation decision](../architecture/2026-08-23-client-derived-tool-presentation.md) still owns deriving UI from recorded facts. This inspector adds no Session events or host presentation fields.
 
+Trajectory thinking opens by default and supports manual disclosure. [Chat disclosure defaults](../bug-fix/2026-09-14-chat-presentation-defaults.md) are a separate presentation decision.
+
 ## Alternatives considered
 
 **Keep source inside the argument tree.** JSON escaping obscures program structure and makes copying executable source cumbersome.
@@ -26,4 +28,4 @@ The [PTC runtime decision](2026-06-15-ptc.md) still owns execution and settlemen
 
 ## Consequences
 
-Readers can inspect and copy recorded programs without changing replay data. Schemas with no recognizable language hint receive no syntax highlighting. Component tests cover recorded-name recognition, schema fallback, exact source and argument copying, output states, and independent wrapping. JSON-tree tests cover clipping geometry, missing `ResizeObserver`, clipboard settlement after hover changes or unmount, and value-read counts during hover. Thinking tests cover [Chat disclosure defaults](../bug-fix/2026-09-14-chat-presentation-defaults.md), manual disclosure, and switching Trajectory records; the [PTC browser scenario](../../../../apps/web/tests/ptc-round.e2e.ts) pins the assembled inspector and verifies overflow and the original-JSON round trip.
+Readers can inspect and copy recorded programs without changing replay data. Schemas with no recognizable language hint receive no syntax highlighting. Component tests cover recorded-name recognition, schema fallback, exact source and argument copying, output states, and independent wrapping. JSON-tree tests cover clipping geometry, missing `ResizeObserver`, clipboard settlement after hover changes or unmount, and value-read counts during hover. Thinking tests cover manual disclosure and switching Trajectory records; the [PTC browser scenario](../../../../apps/web/tests/ptc-round.e2e.ts) pins the assembled inspector and verifies overflow and the original-JSON round trip.
diff --git a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.zh.md b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.zh.md
index a0e82d6b4a..7cdb2321d6 100644
--- a/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-09-ptc-trajectory-code-inspection.zh.md
@@ -16,6 +16,8 @@ PTC 程序以 JSON 字符串参数传入。转义使长程序在通用参数树
 
 [PTC 运行时决策](2026-06-15-ptc.zh.md) 仍负责执行与结算；[客户端展示决策](../architecture/2026-08-23-client-derived-tool-presentation.zh.md) 仍负责从已记录事实派生 UI。此检查器不增加 Session 事件或宿主展示字段。
 
+Trajectory 思考默认展开，并支持手动展开折叠。[Chat 展开默认值](../bug-fix/2026-09-14-chat-presentation-defaults.zh.md)是独立的展示决策。
+
 ## 考虑过的替代方案
 
 **把源码保留在参数树中。** JSON 转义遮蔽程序结构，也使复制可执行源码变得繁琐。
@@ -26,4 +28,4 @@ PTC 程序以 JSON 字符串参数传入。转义使长程序在通用参数树
 
 ## 后果
 
-读者可以检查和复制已记录的程序，无需修改回放数据。Schema 没有可识别的语言提示时不提供语法高亮。组件测试覆盖记录工具名识别、Schema 回退、源码与参数原样复制、输出状态及独立换行。JSON 树测试覆盖裁剪几何、缺少 `ResizeObserver`、悬停切换或卸载后剪贴板写入落定，以及悬停期间读取值的次数。思考测试覆盖 [Chat 展开默认值](../bug-fix/2026-09-14-chat-presentation-defaults.zh.md)、手动展开折叠及 Trajectory 记录切换；[PTC 浏览器场景](../../../../apps/web/tests/ptc-round.e2e.ts) 固定组装后的检查器展示，并验证溢出和原始 JSON 的往返切换。
+读者可以检查和复制已记录的程序，无需修改回放数据。Schema 没有可识别的语言提示时不提供语法高亮。组件测试覆盖记录工具名识别、Schema 回退、源码与参数原样复制、输出状态及独立换行。JSON 树测试覆盖裁剪几何、缺少 `ResizeObserver`、悬停切换或卸载后剪贴板写入落定，以及悬停期间读取值的次数。思考测试覆盖手动展开折叠及 Trajectory 记录切换；[PTC 浏览器场景](../../../../apps/web/tests/ptc-round.e2e.ts) 固定组装后的检查器展示，并验证溢出和原始 JSON 的往返切换。