init: AFS baseline (config + plugins)

AGENTS.md

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+# Agent Instructions (AFS)
+
+## Do not invent or market
+- No marketing language or product claims.
+- If something is unknown, state "Unknown / needs verification" and propose a test.
+
+## Truth policy
+- Only claim what is evidenced in this repo or cited notes.
+- Do not guess roadmap, compatibility, or performance.
+
+## Scope control
+- Research-only; keep scope to core AFS primitives and APIs.
+
+## Provenance / separation
+- Do not use employer or internal material.
+- If provenance is unclear, leave it out.
+
+## Output style
+- Concise, engineering notebook tone.
+
+## How to verify (tests/commands)
+- Unknown / needs verification (no test harness yet).