Add agent workflow instructions

AGENTS.md

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+# Agent Instructions
+
+- Before making any change, check that the Git working tree is clean.
+- If the working tree is not clean, stop and clarify how to proceed before editing files.
+- After every change, create a Git commit with a concise, meaningful message describing what was done.
+- After committing, push the commit to the tracked remote branch.
+- If commit or push fails, retry the commit and push workflow up to five times.
+- If the workflow still fails after five attempts, report the failure and include the relevant error output.