Phase 0: scaffold tree + manifest

- README, .gitignore, CLAUDE.md (project conventions)
- docs/PHASE0.md — full Phase 0 manifest (locked substrate)
- 10 root .lua modules + 4 ffi/ bindings, all stubs raising NotImplemented
  with module-scoped responsibilities matching the manifest
- config.lua wired to current dirac/hossenfelder endpoints (qwen-coder-7b
  snappy/32k + cloud via OpenRouter through hossenfelder)

File names match docs/PHASE0.md §4 exactly. Module bodies fill in across
later phases; the tree shape is locked.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,19 @@
+# LuaJIT bytecode
+*.luac
+*.ljbc
+
+# Local runtime state
+sessions/
+memory.jsonl
+*.log
+
+# Editor scratch
+.*.sw?
+*~
+
+# Local config overrides (committed config.lua is the example/default)
+config.local.lua
+
+# OS noise
+.DS_Store
+Thumbs.db