chore: context pack for aicc-capsule reference testbed

- AGENTS.md: build instructions for AI coding agents
- docs/: AICC core spec copy, JSON schema, testbed design notes
- scripts/: setup.sh, BUILDLOG.md
- README.md: overview and reading order

scripts/BUILDLOG.md

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+# aicc-capsule build log
+# Fill this in as you go. Keep it short — one line per milestone.
+
+- [ ] 2026-08: context pack created (AGENTS.md, docs, scripts)
+- [ ] bridge skeleton: world + capsule + WebSocketServer
+- [ ] tools: proprioception, vision, move, turn, look_at, interact (+ echo/boom/bump for conformance)
+- [ ] conformance 9/9 green
+- [ ] agent demo loop (LLM drives capsule to beacon, interacts)
+- [ ] README in testbed/ with run instructions

scripts/setup.sh

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+#!/usr/bin/env bash
+# Setup script for aicc-capsule: create venv, install deps.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+python3 -m venv testbed/.venv
+source testbed/.venv/bin/activate
+pip install --upgrade pip
+# aicc-py SDK from sibling checkout
+pip install -e "$HOME/Desktop/aicc-py"
+# Engine and demo deps go here (e.g. ursina, panda3d, pillow, websockets)
+# pip install ...
+
+echo "Setup done. Activate with: source testbed/.venv/bin/activate"