fix(sync): route sessions by server-confirmed directory, unstick queued sends

Session directory resolution had no precedence contract: the selection-time
directory short-circuited every lookup, and a persisted runtime value was
consulted before the authoritative record. A worktree session selected before
its directory store bootstrapped kept the active-directory fallback, and that
guess was persisted, so it survived reloads and restarts.

Directory resolution now lives in one module and orders sources by whether the
server confirmed the path, not by whether the value is local or synced:
authoritative (the child store that holds the session) > server-confirmed
selection > worktree attachment/metadata (the requested path, pre-canonical) >
remembered. A guessed selection is no longer persisted, remembered, or ranked.
Chips read the same resolution the composer used, so queue keys cannot diverge.

Queued auto-send could strand an item indefinitely: backoff, missing send
configuration, and the recent-abort window all returned without scheduling a
wake-up, so the queue only retried when an unrelated status or directory change
re-ran the effect. A retry scheduler now wakes it at the earliest known time.

A rejected send rolls the optimistic message back while the composer stays
silent for transport failures, which makes it indistinguishable from nothing
happening. Failures are now recorded to a bounded in-memory log surfaced in the
About diagnostics report, alongside a directory-resolution breakdown, plus
__opencodeDebug.diagnoseSessionDirectory() and getRecentSendFailures().

Prompted by a report of worktree prompting silently failing. That failure was
not reproduced locally, so the diagnostics are what will identify it.

packages/ui/src/lib/debug.ts

@@ -1,12 +1,19 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
-import { useSessionUIStore } from '@/sync/session-ui-store';
+import { useSessionUIStore, getRememberedSessionDirectory } from '@/sync/session-ui-store';
 import { useDirectoryStore } from '@/stores/useDirectoryStore';
 import { useProjectsStore } from '@/stores/useProjectsStore';
 import { opencodeClient } from '@/lib/opencode/client';
 import { checkIsGitRepository } from '@/lib/gitApi';
 import { streamDebugEnabled } from '@/stores/utils/streamDebug';
 import { copyTextToClipboard as copyPlainTextToClipboard } from '@/lib/clipboard';
-import { getSyncSessions, getSyncMessages, getSyncParts } from '@/sync/sync-refs';
+import { getSyncSessions, getSyncMessages, getSyncParts, getAllSyncSessions, getSyncSessionDirectory } from '@/sync/sync-refs';
+import {
+  describeSessionDirectorySources,
+  resolveSessionDirectoryFromSources,
+} from '@/sync/session-directory-resolution';
+import { useSessionWorktreeStore } from '@/sync/session-worktree-store';
+import { getRecentSendFailures } from '@/sync/send-failure-log';
+import { getAttachedSessionDirectory } from '@/sync/session-worktree-contract';
 import { useStreamingStore } from '@/sync/streaming';
 import { runtimeFetch } from '@/lib/runtime-fetch';
 import { getRegisteredRuntimeAPIs } from '@/contexts/runtimeAPIRegistry';
@@ -375,12 +382,107 @@ export const debugUtils = {
       openchamber: {
         settingsInfo,
       },
+      // Empty is a meaningful answer here: it means no prompt was rejected in
+      // this session, so a "my message disappeared" report is not a rejected
+      // send and needs a different explanation.
+      recentSendFailures: getRecentSendFailures(),
+      currentSessionDirectoryResolution: sessionState.currentSessionId
+        ? this.diagnoseSessionDirectory(sessionState.currentSessionId)
+        : null,
     };
 
     console.log('[DEBUG] App status snapshot:', report);
     return report;
   },
 
+  /**
+   * Prompt sends that were rejected and rolled back in this app session.
+   * Newest first; empty means no send was rejected.
+   */
+  getRecentSendFailures() {
+    const failures = getRecentSendFailures();
+    if (failures.length === 0) {
+      console.log('[OK] No prompt sends were rejected in this session.');
+    } else {
+      console.warn(`[ALERT] ${failures.length} rejected prompt send(s):`);
+      console.table(failures);
+    }
+    return failures;
+  },
+
+  /**
+   * Report how a session's directory is resolved, from every source, in
+   * precedence order. A send is routed by the winning value, so a disagreement
+   * here explains a prompt that vanishes without an error: it was posted
+   * against a directory that does not own the session.
+   */
+  diagnoseSessionDirectory(sessionId?: string) {
+    const sessionState = useSessionUIStore.getState();
+    const targetSessionId = sessionId ?? sessionState.currentSessionId;
+
+    if (!targetSessionId) {
+      console.log('[ERROR] No session selected and no session id passed');
+      return null;
+    }
+
+    const attachment = getAttachedSessionDirectory(
+      useSessionWorktreeStore.getState().getAttachment(targetSessionId),
+    );
+    const worktreeMetadata = sessionState.worktreeMetadata.get(targetSessionId)?.path ?? null;
+    const owningStoreDirectory = getSyncSessionDirectory(targetSessionId);
+    const sessionRecord = getAllSyncSessions().find((session) => session.id === targetSessionId);
+    const recordDirectory = (sessionRecord as { directory?: string | null } | undefined)?.directory ?? null;
+    const selected = targetSessionId === sessionState.currentSessionId
+      ? sessionState.currentSessionDirectory
+      : null;
+
+    const remembered = getRememberedSessionDirectory(targetSessionId);
+
+    const sources = {
+      attachment,
+      worktreeMetadata,
+      authoritative: owningStoreDirectory ?? recordDirectory,
+      selected,
+      remembered: remembered.runtime,
+    };
+
+    const resolution = resolveSessionDirectoryFromSources(sources);
+    const routedDirectory = sessionState.getDirectoryForSession(targetSessionId);
+
+    const report = {
+      sessionId: targetSessionId,
+      isCurrentSession: targetSessionId === sessionState.currentSessionId,
+      routedDirectory,
+      resolvedFrom: resolution.source,
+      conflict: resolution.conflict,
+      sources: describeSessionDirectorySources(sources),
+      details: {
+        owningChildStore: owningStoreDirectory,
+        sessionRecordDirectory: recordDirectory,
+        sessionIndexed: Boolean(sessionRecord),
+        currentSessionDirectory: sessionState.currentSessionDirectory,
+        rememberedForRuntime: remembered.runtime,
+        persistedAcrossRestarts: remembered.persisted,
+        activeDirectory: useDirectoryStore.getState().currentDirectory ?? null,
+        opencodeClientDirectory: opencodeClient.getDirectory() ?? null,
+      },
+    };
+
+    console.log('[DEBUG] Session directory resolution:', report);
+    if (resolution.conflict) {
+      console.warn(
+        `[ALERT] Directory sources disagree: using "${resolution.directory}" (${resolution.source}) `
+        + `while "${resolution.conflict.directory}" came from ${resolution.conflict.source}.`,
+      );
+    } else if (!routedDirectory) {
+      console.warn('[ALERT] No directory resolved for this session — sends fall back to the active directory.');
+    } else {
+      console.log('[OK] All known sources agree on the session directory.');
+    }
+
+    return report;
+  },
+
   async buildDiagnosticsReport() {
     const report = await this.getAppStatus();
     return JSON.stringify(report, null, 2);
@@ -697,6 +799,8 @@ if (typeof window !== 'undefined') {
     console.log('  __opencodeDebug.getAllMessages(truncate?) - List all messages (truncate=true for short preview)');
     console.log('  __opencodeDebug.truncateMessages(messages) - Truncate long fields in messages array');
     console.log('  __opencodeDebug.getAppStatus() - Show app status snapshot');
+    console.log('  __opencodeDebug.diagnoseSessionDirectory(sessionId?) - Show how the session directory is resolved');
+    console.log('  __opencodeDebug.getRecentSendFailures() - List prompt sends that were rejected and rolled back');
     console.log('  __opencodeDebug.checkLastMessage() - Check if last message is problematic');
     console.log('  __opencodeDebug.findEmptyMessages() - Find all empty assistant messages');
     console.log('  __opencodeDebug.showRetryHelp() - Show instructions for handling empty responses');