docs: standardize agent instructions

[jonathanperis]

Summary

• Rename the root harness guide from CLAUDE.md to standardized AGENTS.md
• Move instrumentation memory from .claude/memory/ to .agents/memory/
• Refresh stale architecture memory from the old Next.js/Claude framing to the current Astro/React implementation
• Update README navigation to point at AGENTS.md

Verification

• git grep -n -i -E 'claude|\.claude|CLAUDE' -- . ':!out' || true returns no matches
• Python assertions verify AGENTS.md/.agents exist and CLAUDE.md/.claude do not
• bun run lint
• PUBLIC_GA_ID=G-35CN95481D bun run build

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 128cf425-f7f1-4f27-8b69-03d4adb2637c

📥 Commits

Reviewing files that changed from the base of the PR and between dff1a41 and 0725825.

📒 Files selected for processing (6)

• .agents/memory/MEMORY.md
• .agents/memory/architecture.md
• .claude/memory/MEMORY.md
• .claude/memory/architecture.md
• AGENTS.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/standardize-agents-instructions

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