docs: update README with full config reference, remove completed roadmap

Expands README with complete config.yaml reference, CLI options table,
skills documentation, and updated command list. Removes the old roadmap
(all phases complete). Updates tweaks.md with current design notes.
Adds .sneakycode/ to .gitignore and includes superpowers design specs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/tweaks.md

@@ -1 +1,21 @@
 Pressing up should cycle history like claude code.
+
+~~Remove the user's input from output "you" - it's not needed.~~ Brought back as a condensed one-liner (first line + line count for multi-line).
+
+Smart shell auto-approve: auto-approve `run_command` when the base executable is in the `allowed_commands` list and the full command doesn't match any `denied_commands` prefix. Only prompt the user for commands whose base executable is unlisted. Currently all shell commands prompt regardless, which is tedious for safe read-only commands like `git branch` or `ls`. The allow/deny lists in `ShellToolConfig` already define what's safe — the permissions service just needs to be shell-aware.
+
+Show a token count or some other display for when the model is "thinking" for a long period of time. I want a way for the user to know the model is working on it.
+
+/models command to show models available and temporarly change models in the session
+
+pass a directory to the tool so that it uses that directory as it's root for commands.
+
+add a skills directory so we can prompt our own skills for the tool to use similar to Claude Code
+
+need not only a session log, but also a log of what the llm is thinking and how it's working somehow. I need a way to see behind the curtain.
+
+# Left of from Phase 7 of old roadmap - finish these first
+- Permission modal auto-approves (TODO: proper modal dialog)
+- Session resume auto-resumes (TODO: modal y/n)
+- LLM client cleanup on unmount not yet wired
+- No automated TUI tests (Textual's AppTest can be added later)