KanBorg 1.2.19 — Reliable provider resumes and recovery

Provider continuation and startup recovery fixes.

• Fix Codex conversation resumes: omit the unsupported --sandbox option from codex exec resume, preserving the existing execution policy.
• Recover a missing provider session once using the saved conversation, including the current request.
• Retry a recognized temporary connection failure once, then try another eligible source under existing routing and funding rules.
• Recover from recognized pre-execution CLI/authentication failures without abandoning the saved message.
• Do not blindly replay work after tools or useful output have been produced, or after an unclassified failure.
• Replace the generic subscription failure with a provider-specific explanation. Recovery notices are labeled KanBorg; raw stderr is not displayed.

Validation: installed Codex CLI reproduced the old option rejection and accepted the corrected help-mode invocation (no model call); 75 dispatcher tests and 64 desktop tests passed; desktop/web type checks passed; packaged update recovery and DMG checksum verified.