`fn main() -> Result<()>` let anyhow's Debug impl render failures with a
bare `Error:` header. hive-forge is almost always invoked from an agent's
bash task, where the completion wake points at the task's .out file - so a
failure that only writes to .err is easy to miss entirely (mara's "had no
clue it failed" on #2624).
Wrap the dispatch in a run() and own the failure path in main():
- prefix with the binary name (`hive-forge: FAILED: ...`) so the line is
unmistakably ours in a mixed transcript,
- render with {:#} (alternate Display), which keeps the full context chain
inline - plain Display would have dropped every `.context()` below the
top one,
- return ExitCode::FAILURE explicitly rather than relying on the Termination
impl.
Half of #2624: the other half (surfacing .err in the bash-mcp completion
when a task exits non-zero) is damocles's, per the issue thread.
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