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>

router.lua

@@ -0,0 +1,14 @@
+-- router.lua — task classifier: meta / shell / AI.
+-- See docs/PHASE0.md §5.
+
+local M = {}
+
+-- Classify an input line.
+-- Returns one of: "meta", "shell", "ai" plus the (possibly stripped) payload.
+function M.classify(line, config)
+    error("router.classify: not implemented (Phase 0 pending)")
+end
+
+-- Default known-command allowlist seeds the heuristic in §5.1.
+-- Final list is config.shell.known_commands at runtime.
+return M