Add testing and quality check requirements to AGENTS.md

- Add coding convention: always include tests with new features and
bug fixes - Add 'Required Checks Before Completing Tasks' section -
Instruct agents to run 'bild --test' and 'lint' on modified namespaces
- Require fixing all errors before marking tasks complete

Completed tasks: - t-s9T0u1: Add testing guidance - t-v2w3x4: Add
build/lint instructions

Amp-Thread-ID:
https://ampcode.com/threads/T-85f4ee29-a529-4f59-ac6f-6ffec75b6a56
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/AGENTS.md b/AGENTS.md
index e30b01a..9450a0a 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -316,6 +316,7 @@ repl.sh --bash Omni/Log.py      # Start bash shell for namespace
 
 1. **Test interface**: Every program must accept `test` as a first argument to run its test suite
 2. **Entrypoint naming**: The entrypoint for every program shall be called `main`
+3. **Always include tests**: Every new feature and bug fix must include tests. No code should be committed without corresponding test coverage
 
 ## Git Workflow
 
@@ -380,6 +381,20 @@ git submit
 3. **Rebase and clean up history** - Use `git commit --amend` and `git restack` to keep history clean
 4. **Test before committing** - Run `bild --test` and `lint` on affected namespaces
 
+### Required Checks Before Completing Tasks
+
+After completing a task, **always** run these commands for the namespace(s) you modified:
+
+```bash
+# Run tests
+bild --test Omni/YourNamespace.hs
+
+# Run linter
+lint Omni/YourNamespace.hs
+```
+
+**Fix all reported errors** related to your changes before marking the task as complete. This ensures code quality and prevents breaking the build for other contributors.
+
 ## Future Enhancements
 
 Planned features (not yet implemented):