Merge remote-tracking branch 'origin/master' into xtr/agent-loop-message-machine

# Conflicts:
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/session.i18n.yaml
#	docs/event-producer-consumer.md
#	examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl

docs/core-data-structures/session.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 docs/core-data-structures/session.md
-session.md: bc8744887e66726deff732f656bde7fed5a73639
-session.zh.md: 9d00cc891991d5d37968fcf5344291cd2eec1f08
+session.md: 058236cb628f0e517fe18b0e4276dba46bd6b0b0
+session.zh.md: 2d8022c7892828a30094728a1449d16dddd2fd89

docs/core-data-structures/session.md

@@ -342,6 +342,18 @@ declare class Session {
   readonly header: SessionHeader;
   /** The session identity, derived from its durable header's single copy. */
   get id(): SessionId;
+  /**
+   * The first seq appended IN THIS PROCESS: the length of the constructor
+   * seed (0 without one). Events below it entered through construction —
+   * replay, fork, or resume — and were never published on the `session/event`
+   * firehose (constructor seeds do not emit), so consumers that replay the
+   * log as a publication substitute (telemetry adoption) start here. Distinct
+   * from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
+   * session's constructor seed is its full stored log, while its header keeps
+   * the original fork value — this field is the in-process construction fact
+   * and is deliberately not persisted.
+   */
+  readonly firstLiveSeq: number;
   constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);
   /**
    * An immutable snapshot of the append-only event log. The snapshot is reused

docs/core-data-structures/session.zh.md

@@ -344,6 +344,18 @@ declare class Session {
   readonly header: SessionHeader;
   /** The session identity, derived from its durable header's single copy. */
   get id(): SessionId;
+  /**
+   * The first seq appended IN THIS PROCESS: the length of the constructor
+   * seed (0 without one). Events below it entered through construction —
+   * replay, fork, or resume — and were never published on the `session/event`
+   * firehose (constructor seeds do not emit), so consumers that replay the
+   * log as a publication substitute (telemetry adoption) start here. Distinct
+   * from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
+   * session's constructor seed is its full stored log, while its header keeps
+   * the original fork value — this field is the in-process construction fact
+   * and is deliberately not persisted.
+   */
+  readonly firstLiveSeq: number;
   constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);
   /**
    * An immutable snapshot of the append-only event log. The snapshot is reused