Merge branch 'master' into feat/codex-resume

master and this branch both rewrote the two `_claudeSessionId` resets inside
`start()`, so `src/session.ts` conflicted at both of them.

master's commit ccfda623 puts `restoredConversation` at the head of each
fallback chain. A restored mux attach means the CLI never stopped, so a
`/clear` before the Codeman restart may already have moved it to a
conversation the launch id knows nothing about. The persisted chain's tail is
that conversation, and the CLI's own hook reported it first-hand.

This branch adds `this._codexConfig?.resumeSessionId` to the same two chains,
so a resumed codex session keeps its thread-id alias across every mux reattach
and boot recovery.

Both fixes belong. Each chain now reads restoredConversation, then
_resumeSessionId, then omp's alias, then codex's alias, then the launch id.
The comments from both sides are kept.

test/session-claude-conversation-chain.test.ts pins the shape of those two
assignments by matching the source text, and its pattern named omp's alias as
the last term before `this.id`. Codex's alias now sits between the two, so the
pattern widens to pin the ends of the chain and let the middle grow. A `[^;]`
run cannot cross a statement boundary, so each match is still one assignment.

Checked on the merged tree: typecheck, lint, prettier and the frontend syntax
check all pass, and the CI suite runs 6721 tests green across 349 files.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/session.ts

@@ -156,6 +156,11 @@ const WIRE_ACTIVITY_SETTLE_MS = 15_000;
 /** Graceful shutdown delay when stopping session (100ms) */
 const GRACEFUL_SHUTDOWN_DELAY_MS = 100;
 
+// Conversations kept in a pane's chain. A pane that /clears repeatedly would
+// otherwise grow state.json without bound; 32 covers any real session's history
+// and the oldest entries are the ones whose transcripts Claude Code has pruned.
+const MAX_CLAUDE_SESSION_CHAIN = 32;
+
 // Filter out terminal focus escape sequences (focus in/out reports)
 // ^[[I (focus in), ^[[O (focus out), and the enable/disable sequences
 // eslint-disable-next-line no-control-regex
@@ -438,6 +443,17 @@ export class Session extends EventEmitter {
   private _wireActivityAt: number;
   private _wireActivitySettleUntil: number;
   private _claudeSessionId: string | null = null;
+  // Set only when the id came from the CLI's own UserPromptSubmit/Stop hook
+  // payload, keyed on this pane's $CODEMAN_SESSION_ID. That binding is a fact,
+  // not a correlation: it never consults cwd, so a sibling pane on the same
+  // folder cannot steal it. Runtime-only — a restart must re-earn it from the
+  // next hook rather than trust a persisted claim.
+  private _claudeSessionIdIsFirstHand = false;
+  // Conversations this pane has been on, oldest first, current last. Grows only
+  // through a first-hand adoption, so it can never splice in a foreign
+  // conversation. Persisted, because `/clear` is otherwise unrecoverable: the
+  // predecessor id exists nowhere else once the pane moves on.
+  private _claudeSessionChain: string[] = [];
   private _totalCost: number = 0;
   private _messages: ClaudeMessage[] = [];
   private _lineBuffer: string = '';
@@ -660,6 +676,8 @@ export class Session extends EventEmitter {
       attachmentHistory?: SessionAttachmentHistoryItem[];
       /** Restored wall-clock ms of the pane's last Enter (see `lastSubmitAt`). */
       lastSubmitAt?: number;
+      /** Restored conversation chain, oldest first (see `claudeSessionChain`). */
+      claudeSessionChain?: string[];
       /** Restored wall-clock ms of the pane's last output (recovery only; see `_wireActivityAt`). */
       lastActivityAt?: number;
       /** Remote execution metadata for sessions launched through SSH inside local tmux. */
@@ -723,6 +741,13 @@ export class Session extends EventEmitter {
     // response viewer re-derive the live conversation without waiting for the
     // user to type again.
     this._lastSubmitAt = config.lastSubmitAt ?? 0;
+    // Restored chain: its tail is the conversation the CLI was actually on when
+    // the server stopped, which outranks the launch id seeded just above. The
+    // FIRST-HAND flag is deliberately NOT restored — a persisted claim is not a
+    // fact, so the pane re-earns the guess-free path from its next hook.
+    this._claudeSessionChain = Array.isArray(config.claudeSessionChain) ? [...config.claudeSessionChain] : [];
+    const restoredConversation = this._claudeSessionChain[this._claudeSessionChain.length - 1];
+    if (restoredConversation) this._claudeSessionId = restoredConversation;
     this._mux = config.mux || null;
     this._useMux = config.useMux ?? (this._mux !== null && this._mux.isAvailable());
     this._muxSession = config.muxSession || null;
@@ -921,6 +946,20 @@ export class Session extends EventEmitter {
     return this._claudeSessionId;
   }
 
+  /**
+   * True when `claudeSessionId` came from the CLI's own hook payload rather than
+   * from the launch config or a history correlation. The response viewer uses it
+   * to skip guessing entirely — see resolveActiveClaudeSessionIdFromHistory().
+   */
+  get claudeSessionIdIsFirstHand(): boolean {
+    return this._claudeSessionIdIsFirstHand;
+  }
+
+  /** Conversations this pane has been on, oldest first, current last. */
+  get claudeSessionChain(): readonly string[] {
+    return this._claudeSessionChain;
+  }
+
   /** Docker execution metadata when this session runs inside a container, else undefined. */
   get docker(): SessionDocker | undefined {
     return this._docker;
@@ -978,11 +1017,38 @@ export class Session extends EventEmitter {
   // payload). In interactive PTY mode Claude CLI emits no JSON to stdout, so
   // `_handleJsonMessage` never sees `session_id`; hooks are the only signal
   // that conveys a post-/clear conversation switch.
-  adoptClaudeSessionId(newId: string): void {
-    if (!newId || newId === this._claudeSessionId) return;
+  //
+  // `firstHand` marks an id that came from the CLI process itself — a hook
+  // payload whose delivery was keyed on this pane's $CODEMAN_SESSION_ID. Only
+  // those extend the chain: a history-correlated guess must never be able to
+  // write a foreign conversation into this pane's permanent record.
+  adoptClaudeSessionId(newId: string, options: { firstHand?: boolean } = {}): void {
+    if (!newId) return;
+    if (options.firstHand) {
+      this._claudeSessionIdIsFirstHand = true;
+      this._recordClaudeSessionInChain(newId);
+    }
+    if (newId === this._claudeSessionId) return;
     this._claudeSessionId = newId;
   }
 
+  /**
+   * Append to the conversation chain, oldest first. A repeat of the current tail
+   * is a no-op (every prompt in a conversation reports the same id), and an id
+   * already in the chain moves to the tail rather than duplicating, which is
+   * what a `/resume` back to an earlier conversation does.
+   */
+  private _recordClaudeSessionInChain(id: string): void {
+    if (this._claudeSessionChain[this._claudeSessionChain.length - 1] === id) return;
+    const existing = this._claudeSessionChain.indexOf(id);
+    if (existing !== -1) this._claudeSessionChain.splice(existing, 1);
+    this._claudeSessionChain.push(id);
+    // A pane that /clears in a loop must not grow this without bound.
+    if (this._claudeSessionChain.length > MAX_CLAUDE_SESSION_CHAIN) {
+      this._claudeSessionChain.splice(0, this._claudeSessionChain.length - MAX_CLAUDE_SESSION_CHAIN);
+    }
+  }
+
   /** The tmux session name, if the session is running inside a mux */
   get muxName(): string | null {
     return this._muxSession?.muxName ?? null;
@@ -1416,6 +1482,12 @@ export class Session extends EventEmitter {
       respawnBlocked: this._respawnBlocked || undefined,
       attachmentHistory: this.attachmentHistory.length > 0 ? this.attachmentHistory : undefined,
       lastSubmitAt: this._lastSubmitAt || undefined,
+      // Only a chain the CLI's own hooks vouched for is persisted, and only when
+      // the pane actually moved conversation. Its LAST entry is the live one, so
+      // it is also what restores `claudeSessionId` across a restart — `start()`
+      // resets that field to the launch id at three separate points, which is
+      // why a recovered pane otherwise shows its pre-/clear transcript forever.
+      claudeSessionChain: this._claudeSessionChain.length > 0 ? [...this._claudeSessionChain] : undefined,
       // envOverrides intentionally NOT on the public SessionState type — they must not
       // leak into SSE / GET /api/sessions broadcasts (schema allows OPENCODE_*, which
       // can carry secrets). For disk persistence, session-manager calls
@@ -1955,6 +2027,11 @@ export class Session extends EventEmitter {
       }, REMOTE_CLI_VERSION_PROBE_DELAY_MS);
     }
 
+    // ⚠️ Hoisted, because the "third reset point" below runs unconditionally
+    // AFTER the mux branch and would otherwise stomp the restored conversation
+    // straight back to the launch id.
+    let restoredConversation: string | undefined;
+
     // If mux wrapping is enabled, create or attach to a mux session
     if (this._useMux && this._mux) {
       try {
@@ -1999,8 +2076,19 @@ export class Session extends EventEmitter {
         // reason: its thread id lives in `_codexConfig`, so without it every
         // respawn drops a resumed codex session's alias and its Past-Sessions
         // row springs back as a duplicate that still resumes.
+        // ⚠️ A RESTORED mux session is the one case where the launch id is a
+        // lie: the CLI never stopped, so a `/clear` before the Codeman restart
+        // already moved it to a conversation `this.id` knows nothing about. The
+        // persisted chain's tail is that conversation, reported first-hand by
+        // the CLI's own hook, so it outranks every fallback here. A NEW pane has
+        // an empty chain and falls through to the resume/alias fallbacks.
+        restoredConversation = isRestored ? this._claudeSessionChain[this._claudeSessionChain.length - 1] : undefined;
         this._claudeSessionId =
-          this._resumeSessionId || this._ompConfig?.resumeSessionId || this._codexConfig?.resumeSessionId || this.id;
+          restoredConversation ||
+          this._resumeSessionId ||
+          this._ompConfig?.resumeSessionId ||
+          this._codexConfig?.resumeSessionId ||
+          this.id;
 
         // For NEW mux sessions: wait for readiness then clean buffer
         // For RESTORED mux sessions: don't do anything - client will fetch buffer on tab switch
@@ -2104,8 +2192,16 @@ export class Session extends EventEmitter {
     // the ompConfig and codexConfig fallbacks or it stomps the mux branch's
     // correctly-resolved OMP/codex alias back to this.id on every mux/plain-
     // reattach boot recovery (the "third reset point" — see DECISIONS.md).
+    // For the same reason it needs `restoredConversation`: on a RESTORED mux
+    // attach the CLI never stopped and may have `/clear`ed before the restart,
+    // so the launch id is a lie and the chain's tail is the live conversation.
+    // It is empty on every other path, so those paths keep the alias chain.
     this._claudeSessionId =
-      this._resumeSessionId || this._ompConfig?.resumeSessionId || this._codexConfig?.resumeSessionId || this.id;
+      restoredConversation ||
+      this._resumeSessionId ||
+      this._ompConfig?.resumeSessionId ||
+      this._codexConfig?.resumeSessionId ||
+      this.id;
 
     this._pid = this.ptyProcess.pid;
     console.log('[Session] Interactive PTY spawned with PID:', this._pid);
@@ -3232,6 +3328,16 @@ export class Session extends EventEmitter {
     }
   }
 
+  /**
+   * A prompt was submitted, reported by the CLI's own UserPromptSubmit hook.
+   * `_trackSubmit` only sees input that flows through Codeman's write path, so
+   * a pane the user drives by attaching to tmux directly never stamped this and
+   * `lastSubmitAt` stayed 0 for its whole life.
+   */
+  markPromptSubmitted(): void {
+    this._lastSubmitAt = Date.now();
+  }
+
   /**
    * Per-client highest-applied input sequence, for exactly-once input delivery.
    * Keyed by the web client's stable `clientId`. Bounded so many devices over a