The dpaste.com fallback path kept pastes for 7 days (vs the promised
6-hour auto-delete), could not be deleted by `hermes debug delete`
(anonymous pastes have no owner token), and the pending-paste sweep
skipped dpaste URLs entirely — while the share output still claimed
pastes auto-delete in 6 hours.
- Default the dpaste.com fallback retention to 1 day (dpaste's minimum)
across --expire, upload_to_pastebin, and build_debug_share so the
dashboard endpoint benefits too
- Print an accurate warning when uploads fall back to dpaste.com
(retention window + no delete path) instead of the 6-hour promise
- Mention the fallback retention in the CLI and gateway privacy notices
before the user consents to uploading
- Explain in `hermes debug delete` errors why dpaste.com pastes cannot
be deleted and that they expire on their own
Refs #106164
[salvage: trimmed to 2 invariant tests (dpaste delete error, dpaste fallback notice);
5 duplicative default-value tests dropped]
liuhao1024
77ca949b90