Add an explicit overlay unfocus target so callers can move input to the editor or another component while overlays remain visible. Align fallback overlay focus with visual focus order and cover blocked replacement release, null targets, and multi-overlay cycling.
Preserve a focused visible overlay as the input owner across extension custom UI replacement, while letting the replacement receive and close its own input before focus is restored. Fixes#5129.
detectCapabilities previously disabled hyperlinks under tmux unconditionally. tmux re-emits OSC 8 to the outer terminal only when the attached client advertises the 'hyperlinks' feature in client_termfeatures, and strips them otherwise.
Probe the running server with 'tmux display-message -p #{client_termfeatures}' and enable hyperlinks only when the feature is listed. The probe fails closed: any error (no tmux/server, timeout, old tmux) yields false. images stays null; only the hyperlink decision changed. The probe is injected into detectCapabilities so it stays testable without spawning a process.
Wrap the path shown in read/write/edit/ls tool titles in an OSC 8 file:// hyperlink when the terminal advertises hyperlink support.
The link target is always the absolute path, while the visible text stays relative/home-shortened and line annotations (e.g. :120-140) are kept out of the target.
Honour StreamOptions.headers in the Bedrock provider by attaching a
Smithy build-step middleware that merges caller headers into the
request before SigV4 signing. Reserved headers (x-amz-*, authorization,
host) are silently skipped to preserve signing and the bearer-token
auth path. No-op when no headers are supplied. Updates the
StreamOptions.headers JSDoc to drop the Bedrock caveat.
Signal-triggered shutdown (SIGTERM/SIGHUP) now emits session_shutdown
before any terminal writes, and SIGHUP no longer hard-exits, so extension
resources (e.g. sockets) are released and the terminal is restored even
when the terminal is gone. A genuinely dead terminal still exits without
hot-spinning via the EIO error path.
closes#5080
