aicc/0.1: initial draft

- core.md: human-readable specification covering message format,
  session manifest, tool taxonomy (sensors/actuators/generators),
  tool invocation, events, capabilities, time/causality, memory,
  errors, extension rules, security, conformance.
- schemas/aicc.schema.json: JSON Schema for all message types,
  validated with Draft 2020-12.
- LICENSE: MIT.
- README.md: repository layout, design principles, versioning,
  conformance criteria.

.gitignore

@@ -0,0 +1,26 @@
+# Build / editor artifacts
+*.swp
+*.swo
+.DS_Store
+.idea/
+.vscode/
+
+# Python
+__pycache__/
+*.pyc
+.venv/
+venv/
+
+# Node
+node_modules/
+
+# Testbed outputs
+testbed/renders/
+testbed/sessions/
+
+# Conformance local state
+conformance/.cache/
+conformance/.local/
+
+# OS
+Thumbs.db