Web→CLI teleported sessions not appearing in Resume Session list

Bug description

Sessions teleported from Claude Code Web (claude.ai/code) to the local CLI sometimes don't appear in the Resume Session picker (claude -r / /resume).

Root cause

The session .jsonl file's first line has type: "file-history-snapshot" instead of a session-type entry. The actual conversation data (with type: "system", type: "user", etc.) starts from line 1 onward.

It appears the session indexer (sessions-index.json) only inspects the first line of each .jsonl file to determine whether it's a session. When it sees file-history-snapshot, it skips the file entirely — even though valid session data exists in subsequent lines.

Line 0: {"type": "file-history-snapshot", ...}       ← indexer stops here
Line 1: {"type": "system", "sessionId": "004cc9d6-...", "gitBranch": "claude/fix-toc-formatting-Px8XU", "slug": "sharded-sleeping-pebble", "compactMetadata": {...}, ...}
Line 2: {"type": "user", "sessionId": "004cc9d6-...", ...}
Line 3: {"type": "assistant", "sessionId": "004cc9d6-...", ...}
...

Steps to reproduce

1. Start a session on Claude Code Web (claude.ai/code)
2. Work for a while (long enough for auto-compaction to trigger)
3. Teleport the session to the local CLI
4. Complete the work and exit
5. Try to resume with claude -r — the session does not appear in the list

Expected behavior

Teleported sessions should be registered in sessions-index.json and appear in the Resume Session picker, regardless of the first line's type in the .jsonl file.

Environment

• Claude Code CLI version: 2.1.49 (version at time of teleport)
• OS: macOS (Darwin 25.3.0)

Additional context

• The session data is fully intact in the .jsonl file — it's only the index that's missing the entry
• The compactMetadata field suggests the web session was auto-compacted before teleport, which may be related to the write order issue
• Out of 87 .jsonl files in the project directory, only 29 were indexed — 68 were orphaned (most are file-history-snapshot type)