Prompt templates

Prompt templates are flat Markdown files that become bare slash commands. Put them in one of these folders (later folders win when names collide):

~/.agents/prompts/
~/.niminal/prompts/
<workspace>/.agent/prompts/
<workspace>/.agents/prompts/
<workspace>/.niminal/prompts/

Project prompt folders load only when the workspace is trusted.

Example

Save .niminal/prompts/review.md:

---
description: Review the current changes.
---

Review the current diff for correctness and style.
Focus on: $ARGUMENTS

Type /review parser edge cases in the TUI. niminal sends the expanded body, with $ARGUMENTS or $@ replaced by the text after /review.

Only *.md files directly inside those folders are discovered (no subfolders)
Files over 100,000 bytes are ignored
Built-in slash commands keep their names; templates cannot override them
Optional frontmatter description feeds Tab completion; without it, the first useful body line is used

Templates become user messages to the model, not local commands.