v3.9.17

Fixed

• Critical: eliminate "Cannot start a runtime from within a runtime" panic —
  Root cause (repro: vena/ctx_read_repro):
  the post-read autonomy prefetch re-enters the read dispatch from inside the async
  tool pipeline; nested reads hit try_delivery_check_blocking /
  try_cache_check_blocking which called DELIVERY_RUNTIME.block_on() on a
  tokio-rt-worker thread — panic. Fix: delivery_block_on() helper detects ambient
  runtime via Handle::try_current() and spawns a scoped thread for the block_on.
  Affects all projects with cross-file imports where prefetch selects map/signatures mode.
• Tool handler session locks — replaced Handle::block_on() in spawn_blocking
  contexts with bounded_lock spin-loops (ctx_read, ctx_delta, ctx_edit, ctx_fill,
  ctx_knowledge, ctx_patch, ctx_smart_read) and isolated runtimes (ctx_tools gateway).

Changed

• multi_path.rs session read: replaced block_in_place with try_read_owned spin-loop.

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: v3.9.17...v3.9.17