docs: add documentation & housekeeping checklist to PR template

Add a second checklist section covering common oversights seen in PRs:
- Update relevant docs (README, docs/, docstrings)
- Update cli-config.yaml.example when adding config keys
- Update CONTRIBUTING.md/AGENTS.md for architecture changes
- Consider cross-platform impact (Windows/macOS)
- Update tool schemas when changing tool behavior

Each item has an 'or N/A' option so contributors aren't blocked
on items that don't apply to their change.

.github/PULL_REQUEST_TEMPLATE.md

@@ -40,6 +40,8 @@ Fixes #
 
 <!-- Complete these before requesting review. -->
 
+### Code
+
 - [ ] I've read the [Contributing Guide](https://github.com/NousResearch/hermes-agent/blob/main/CONTRIBUTING.md)
 - [ ] My commit messages follow [Conventional Commits](https://www.conventionalcommits.org/) (`fix(scope):`, `feat(scope):`, etc.)
 - [ ] I searched for [existing PRs](https://github.com/NousResearch/hermes-agent/pulls) to make sure this isn't a duplicate
@@ -48,6 +50,16 @@ Fixes #
 - [ ] I've added tests for my changes (required for bug fixes, strongly encouraged for features)
 - [ ] I've tested on my platform: <!-- e.g. Ubuntu 24.04, macOS 15.2, Windows 11 -->
 
+### Documentation & Housekeeping
+
+<!-- Check all that apply. It's OK to check "N/A" if a category doesn't apply to your change. -->
+
+- [ ] I've updated relevant documentation (README, `docs/`, docstrings) — or N/A
+- [ ] I've updated `cli-config.yaml.example` if I added/changed config keys — or N/A
+- [ ] I've updated `CONTRIBUTING.md` or `AGENTS.md` if I changed architecture or workflows — or N/A
+- [ ] I've considered cross-platform impact (Windows, macOS) per the [compatibility guide](https://github.com/NousResearch/hermes-agent/blob/main/CONTRIBUTING.md#cross-platform-compatibility) — or N/A
+- [ ] I've updated tool descriptions/schemas if I changed tool behavior — or N/A
+
 ## For New Skills
 
 <!-- Only fill this out if you're adding a skill. Delete this section otherwise. -->