* Ensure API update is sent on script exit
Add exit-time telemetry handling across scripts to avoid orphaned "installing" records. Introduce local exit_code capture in api_exit_script and cleanup handlers and, when POST_TO_API_DONE is true but POST_UPDATE_DONE is not, post a final status (marking failures on non-zero exit codes, or marking done/failed in VM cleanups based on exit code). Changes touch misc/build.func, misc/vm-core.func and various vm/*-vm.sh cleanup functions to reliably send post_update_to_api on normal or early exits.
* Update api.func
* fix(telemetry): add missing exit codes to explain_exit_code()
- Add curl error codes: 4, 5, 8, 23, 25, 30, 56, 78
- Add code 10: Docker/privileged mode required (used in ~15 scripts)
- Add code 75: Temporary failure (retry later)
- Add BSD sysexits.h codes: 64-77
- Sync error_handler.func fallback with canonical api.func
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