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>

README.md

@@ -0,0 +1,36 @@
+# aish
+
+**aish** — AI-augmented conversational shell.
+
+A unified REPL backed by language models accessed through a llama.cpp broker.
+Shell execution, AI inference, context management, and session memory in one
+terminal interface.
+
+Implementation: LuaJIT 2.x with FFI bindings (libcurl, GNU readline, libc),
+no compiled extensions, no build step.
+
+## Status
+
+**Pre-implementation.** Phase 0 manifest only — see
+[`docs/PHASE0.md`](docs/PHASE0.md) for the full substrate, scope, technology
+decisions, directory layout, dispatch model, broker contract, execution
+model, configuration, and planned phase sequence.
+
+## Directory layout
+
+See `docs/PHASE0.md` §4. File names are stable across phases — later phases
+fill in module bodies, they do not rename files.
+
+## Running
+
+Not runnable yet. Once Phase 0 lands:
+
+```sh
+luajit main.lua [--config <path>]
+```
+
+## Project conventions
+
+This repo follows the 8(+1) phase loop documented in mfritsche's home-project
+canon (`feedback_dev_process.md` in claude-noether memory). Each phase has its
+own document under `docs/`. The Phase 0 manifest is the locked substrate.