feat(coder): Add Coder agent, README, and file creation tool

This commit introduces a new AI agent called "Coder" that assists with coding tasks. It
includes a README file outlining the Coder agent's features, examples, and similar
projects. Additionally, a new tool `fs_create.sh` is provided for creating files.

The motivation behind this is to provide an AI assistant capable of handling various
coding-related operations, such as project structure creation, screenshot-to-code
conversion, file system operations, code analysis, and diff-based file editing. The
`fs_create.sh` tool is the first step for file system operations.

agents/coder/README.md

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+# Coder
+
+An AI agent that assists your coding tasks.
+
+## Features
+
+- 🏗️ Intelligent project structure creation and management
+- 🖼️ Convert screenshots into clean, functional code
+- 📁 Comprehensive file system operations (create folders, files, read/write files)
+- 🧐 Advanced code analysis and improvement suggestions
+- 📊 Precise diff-based file editing for controlled code modifications
+
+## Examples
+
+![image](https://github.com/user-attachments/assets/97324fa9-f5ea-44cd-8aea-024d1442ca81)
+
+https://github.com/user-attachments/assets/9363990f-15a9-48c6-b227-8900cfbe0a18
+
+## Similar Projects
+
+- https://github.com/Doriandarko/claude-engineer
+- https://github.com/paul-gauthier/aider

agents/coder/tools.sh

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+#!/usr/bin/env bash
+set -e
+
+# @env LLM_OUTPUT=/dev/stdout The output path
+
+ROOT_DIR="${LLM_ROOT_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)}"
+
+# @cmd Create a new file at the specified path with contents.
+# @option --path! The path where the file should be created
+# @option --contents! The contents of the file
+fs_create() {
+    "$ROOT_DIR/utils/guard_path.sh" "$argc_path" "Create '$argc_path'?"
+    mkdir -p "$(dirname "$argc_path")"
+    printf "%s" "$argc_contents" > "$argc_path"
+    echo "File created: $argc_path" >> "$LLM_OUTPUT"
+}
+
+# See more details at https://github.com/sigoden/argc
+eval "$(argc --argc-eval "$0" "$@")"

agents/coder/tools.txt

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+fs_mkdir.sh
+fs_ls.sh
+fs_patch.sh
+fs_cat.sh