Fix README: install from source instructions, document model options (#44)

- Replace npm install -g (not yet published) with clone + build + link
- Add Models section documenting --model flag options
- Note npm package coming soon

Closes #36

Co-authored-by: unknown <that-github-user@github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

README.md

@@ -25,7 +25,10 @@ Run N parallel Claude Code agents on the same task, then select the best result
 ## Quick start
 
 ```bash
-npm install -g thinktank
+# Install from source (npm package coming soon)
+git clone https://github.com/that-github-user/thinktank.git
+cd thinktank && npm install && npm run build
+npm link  # makes `thinktank` available globally
 
 # Run 3 parallel agents on a task
 thinktank run "fix the authentication bypass"
@@ -39,6 +42,10 @@ thinktank apply
 
 Requires [Claude Code CLI](https://docs.anthropic.com/en/docs/claude-code) installed and authenticated.
 
+### Models
+
+Use `--model` to select a Claude model: `sonnet` (default), `opus`, `haiku`, or a full model ID like `claude-opus-4-6`.
+
 ## How it works
 
 ```