docs(aidd-context): reduce cognitive load in agents instructions

[alexsoyes]

🎯 What & why

Reduce the reader's cognitive load in the shared AGENTS.md template: reason and prioritize before replying, then lead with the result or recommendation.

🛠️ How it works

• Condense overlapping instructions while preserving evidence, safety, and explicit Git authorization.
• Make memory loading, batching, and delegation task-dependent; address frustration before offering compaction.
• Scope: the project-memory template only, not existing project AGENTS.md files.

🧪 How to verify

• git diff --check: passed.
• Pre-commit checks: 441 tests passed.
• Pre-push checks: knip passed; 5,440 CLI tests passed across 451 files.

✅ I certify

• I DO CERTIFY I READ EACH LINE OF THE PULL REQUEST BECAUSE I AM A SOFTWARE ENGINEER, NOT A AI PUPPY.