https://gitlab.synchro.net/main/sbbs/-/commit/d046117460fa604cd5980b5a
Added Files:
src/syncterm/sftp_wait.c sftp_wait.h
Modified Files:
src/sftp/sftp.h sftp_client.c sftp_outcome.c src/syncterm/CMakeLists.txt GNUmakefile sftp_browser.c sftp_queue.c ssh.c
Log Message:
sftp: invert the client API to send-then-callback

Each sftpc_<op>(state, args, cb, cbdata) builds + sends the request
packet, registers a typed pending entry, and returns immediately.
The recv thread (sftpc_recv) demuxes by request-ID, parses the
reply into the typed pending's fields, and invokes the callback.
No more send_and_wait inside the library Ä the wait belongs to the
caller that wants it.

Pending shape: a common struct sftpc_pending base (req_id, list
links, parse + free_self function pointers, reply ptr, delivered/
aborted flags, callback + cbdata) plus per-op typed extensions
that embed the base as their first field Ä sftpc_realpath_pending, sftpc_open_pending, sftpc_read_pending, sftpc_stat_pending, sftpc_readdir_pending, sftpc_descs_pending. Ops with no extra
result data (close, write, setstat) use the base directly.

Outcome lives on the pending: err, result, estr. estr is heap-
allocated and grown via realloc as records accumulate (errors
aren't a hot path) so there's no fixed-size cap on diagnostic
text Ä important because parts of estr come straight from the
remote (SSH_FXP_STATUS message + lang). struct sftpc_outcome and SFTPC_OUTCOME_DECL are gone from the client side; the server side
keeps its existing flex-array struct sftps_outcome.

SyncTERM scaffolding (throwaway, deletes when the Wren UI lands):

- New sftp_wait.[ch] with sftp_wait_cb (signals an event from
cbdata) plus sftp_sync_<op> blocking wrappers per op. The
existing C-side SFTP UI (sftp_browser, sftp_queue, ssh.c's
sftpc_init / authorized_keys read+write loop) all use these.
- Migration is verbose but mechanical Ä each old call site
becomes "front half + check err/result + read typed field +
sftpc_pending_free". Fine for the alpha-level prototype.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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