fix(analytics): use lstat to skip broken symlinks in JSONL scan

[usubhash]

fs.stat() follows symlinks, so a broken symlink (e.g. ~/.claude/debug/latest pointing to a deleted file) throws ENOENT and aborts the entire conversation scan, causing the dashboard to show 0 conversations.

Switch to fs.lstat() + skip symlinks so the recursive JSONL finder is robust against broken links and any other unreadable entries in ~/.claude.

Fixes: dashboard shows "Found 0 conversations" on macOS when ~/.claude/debug/latest is a dangling symlink

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Summary by cubic

Make the JSONL scan resilient to broken symlinks so analytics doesn’t abort and show 0 conversations. We now inspect entries with fs.lstat and skip symlinks and unreadable items.

• Bug Fixes
  • Use fs.lstat and skip symlinks/unreadable entries in ConversationAnalyzer to prevent ENOENT aborts during scans.
  • Fixes "Found 0 conversations" when ~/.claude/debug/latest is a dangling symlink on macOS.
  • Area: CLI (cli-tool/src/).
  • No new components; no catalog (docs/components.json) change needed.
  • No new environment variables or secrets.

^{Written for commit c7f984c. Summary will update on new commits.}

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[cubic-dev-ai]

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