v3.9.15

Added

• Panic-safe tree-sitter with per-language blocklist — extract_signatures
  now wraps tree-sitter in catch_unwind. If a grammar panics, the language is
  blocklisted for the session and subsequent calls use the regex fallback
  instantly. Medium code files (500–6000 tok) safely get signatures mode
  (~85% compression) instead of full (0% compression).

Fixed

• CRITICAL: ctx_read panic on code files (.rs, .c) — the v3.9.14 auto-mode
  resolver routed all code files >500 tokens through signatures mode, which
  requires tree-sitter parsing. If tree-sitter panicked on any file, the Mutex
  in the signature query cache became poisoned, causing all subsequent
  code-file reads to fail with "lean-ctx internal error". Three fixes:
  1. catch_unwind around tree-sitter — panics in grammars degrade
     gracefully to regex signatures, never crash the session.
  2. Per-language blocklist — panicked languages skip tree-sitter for the
     rest of the session, avoiding repeated catch_unwind overhead.
  3. Mutex poison recovery — get_cached_sig_query now uses
     PoisonError::into_inner() instead of .expect().

Upgrade

lean-ctx update                 # recommended (auto-downloads + refreshes shell hooks)
cargo install lean-ctx          # or
npm update -g lean-ctx-bin      # or
brew upgrade lean-ctx

Note: After upgrading via cargo/npm/brew, run lean-ctx setup to refresh shell aliases. lean-ctx update does this automatically.

Full Changelog: v3.9.15...v3.9.15