* Support Codex pet sidekick animations
* Refine Codex pet defaults and drop unused failed animation state
Always default spritesheetPath to spritesheet.webp when a manifest
omits it, even when explicit frame/animation metadata is present, so
non-Codex bundles still benefit from the standard sheet name.
Drop the 'failed' animation entirely — Orca has no failure state, so
mapping interrupted completions to 'failed' would conflate user
cancellation with agent failure. Codex spritesheets can still expose
a 'failed' row as an asset contract, but it's never selected at runtime.
Co-authored-by: Orca <help@stably.ai>
---------
Co-authored-by: Jinjing <6427696+AmethystLiang@users.noreply.github.com>
Co-authored-by: Orca <help@stably.ai>
