docs: add Credits section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -94,6 +94,16 @@ Skills are domain-specific tool scripts and knowledge discoverable at runtime:
 {"tool": "load_skill.sh",     "args": ["skill-name"]}
 ```
 
+## Credits
+
+Many sources of inspiration:
+
+- [Plan 9 from Bell Labs](https://9fans.net) — for an interesting system
+- [@9fans](https://github.com/9fans) — for the Plan 9 port
+- [Suckless](https://suckless.org) — for articulating good software development principles
+- [@simonfxr](https://github.com/simonfxr) — for a solid agent baseline to "borrow" from
+- [@aws](https://github.com/aws/amazon-q-developer-cli) — for a solid open-source agent implementation
+
 ## License
 
 GPLv3