fix(skills): move dogfood skill into the software-development category

skills/dogfood/SKILL.md sat at the root of the bundled skills tree,
making it one of the few uncategorized skills (Discord /skill
autocomplete listed it under 'uncategorized'; hermes_cli/commands.py
cited it as the example). Move it to
skills/software-development/dogfood/ alongside the other QA/testing
skills (test-driven-development, systematic-debugging,
requesting-code-review).

- git mv skills/dogfood -> skills/software-development/dogfood
  (history preserved)
- fix test fixture path in tests/tools/test_browser_console.py
- update root-level-skill docstring examples (commands.py,
  generate-skill-docs.py) to cite computer-use, which is still root-level
- drop 'dogfood' from the category list in hermes-agent-skill-authoring
  SKILL.md (en + zh-Hans docs mirrors)
- docs: regenerate/move the bundled page to
  software-development-dogfood (en + zh-Hans), update sidebars.ts,
  skills-catalog.md, and the adversarial-ux-test related-skills link

E2E validated: fresh sync_skills() copies to the new nested path;
existing installs with the old flat copy keep it untouched (manifest is
name-keyed, hash unchanged -> skipped, no duplicate);
_get_category_from_path resolves 'software-development'; docusaurus
build green.

website/scripts/generate-skill-docs.py

@@ -284,7 +284,7 @@ def derive_skill_meta(skill_path: Path, source_dir: Path, source_kind: str) -> d
     rel = skill_path.parent.relative_to(source_dir)
     parts = rel.parts
     if len(parts) == 1:
-        # Top-level skill (e.g. skills/dogfood/SKILL.md) -- rare
+        # Top-level skill (e.g. skills/computer-use/SKILL.md) -- rare
         category = parts[0]
         sub = None
         slug = parts[0]