systemic gap argus flagged on PR #798 (timeline verb). every `pub fn
run` in hive-forge/src/verbs/*.rs lacked a `# Errors` block —
violates Rust API guidelines + obscures the failure surface for
operators reading the source.
uniform doc per verb category:
- pure GET + print verbs: "transport error from the Forgejo REST call
+ I/O error from stdout"
- body-from-file verbs (comment/comment_edit/issue_create/issue_edit/
pr_create): adds 'I/O error from --body-file/stdin input'
- file-upload verbs (attach-issue, attach-comment): adds 'file
read/exist check'
- pr_create: also mentions the --push shellout
23 `pub fn run` signatures touched. no behaviour change; pure
documentation sweep. cargo test green (38 tests).
