fix(template_import): Remove silent template-dir fallback in ReplaceFiles offline path
When the workspace container is offline and writeViaEphemeral fails
(docker unavailable), ReplaceFiles previously fell back to writing
to the host-side template directory. This silently returned 200 with
"source: template" while the file change was invisible after restart
because the restart handler reads from the Docker volume, not the
template dir (issue #151).
Now returns 503 Service Unavailable with a message telling the caller
to retry after the workspace starts. The ephemeral write path is
the only correct mechanism for offline-container updates.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
fix: Treat delivery-confirmed proxy errors as delegation success
When proxyA2ARequest returns an error but we have a non-empty
response body with a 2xx status code, the agent completed the work
successfully. The error is a delivery/transport error (e.g., connection
reset after response was received).
Previously, executeDelegation would mark these as "failed" even though
the work was done, causing:
- Retry storms (canvas suggests restart, user retries)
- "error" rendering in canvas even though result is available
- Data loss risk from unnecessary restarts
Now we check for valid response data before marking as failed.
Fixes issue #159.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
