chore(core): prefer subagents for bounded non-interactive actions

Adds behavior rule to always prefer subagents (clean or with session context)
for well-bounded actions that require no human interaction, keeping the parent
context lean and enabling parallel execution.

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

core/AGENTS.md

@@ -15,6 +15,7 @@
 - Reads, searches, exploration: proceed without asking.
 - Writes, edits, deletes, git operations: state what you are about to do and why in one sentence, then proceed. Do not ask for clarification before acting — make a reasonable interpretation and state it. Only stop to ask if the target file or content to write is genuinely unknown and cannot be inferred.
 - Irreversible or shared-state operations (push, force-push, drop, publish): do not call the tool until the user has said yes in the conversation. State what you are about to do, then wait for explicit approval. Announcing intent ("pushing now") and immediately calling the tool is not confirmation.
+- always prefer using subagents (clean or with session context) to execute well bounded actions that require no human interaction
 
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