feat: add ignore filtering to directory listing

- Add `list_directory_filtered` function with ignore logic
- Update `default_gitignore` with common VCS and build patterns
- Integrate ignore filtering into `Workspace.list_dir`
- Rename project to HeroPrompt in README
- Update README features and usage descriptions

lib/develop/codewalker/ignore.v

@@ -8,7 +8,7 @@ module codewalker
 // - Lines starting with '#' are comments; empty lines ignored
 // No negation support for simplicity
 
-const default_gitignore = '__pycache__/\n*.py[cod]\n*.so\n.Python\nbuild/\ndevelop-eggs/\ndownloads/\neggs/\n.eggs/\nlib/\nlib64/\nparts/\nsdist/\nvar/\nwheels/\n*.egg-info/\n.installed.cfg\n*.egg\n.env\n.venv\nvenv/\n.tox/\n.nox/\n.coverage\n.coveragerc\ncoverage.xml\n*.cover\n*.gem\n*.pyc\n.cache\n.pytest_cache/\n.mypy_cache/\n.hypothesis/\n'
+const default_gitignore = '.git/\n.svn/\n.hg/\n.bzr/\nnode_modules/\n__pycache__/\n*.py[cod]\n*.so\n.Python\nbuild/\ndevelop-eggs/\ndownloads/\neggs/\n.eggs/\nlib/\nlib64/\nparts/\nsdist/\nvar/\nwheels/\n*.egg-info/\n.installed.cfg\n*.egg\n.env\n.venv\nvenv/\n.tox/\n.nox/\n.coverage\n.coveragerc\ncoverage.xml\n*.cover\n*.gem\n*.pyc\n.cache\n.pytest_cache/\n.mypy_cache/\n.hypothesis/\n.DS_Store\nThumbs.db\n*.tmp\n*.temp\n*.log\n'
 
 struct IgnoreRule {
 	base    string // relative dir from source root where the ignore file lives ('' means global)

lib/develop/codewalker/tree.v

@@ -110,6 +110,56 @@ pub fn list_directory(base_path string, rel_path string) ![]DirItem {
 	return out
 }
 
+// list_directory_filtered lists the contents of a directory with ignore filtering applied.
+// - base_path: workspace base path
+// - rel_path: relative path from base (or absolute path)
+// - ignore_matcher: IgnoreMatcher to filter out ignored files/directories
+// Returns a list of DirItem with name and type (file/directory), filtered by ignore patterns.
+pub fn list_directory_filtered(base_path string, rel_path string, ignore_matcher &IgnoreMatcher) ![]DirItem {
+	dir := resolve_path(base_path, rel_path)
+	if dir.len == 0 {
+		return error('base_path not set')
+	}
+	entries := os.ls(dir) or { return error('cannot list directory') }
+	mut out := []DirItem{}
+	for e in entries {
+		full := os.join_path(dir, e)
+
+		// Calculate relative path from base_path for ignore checking
+		mut check_path := if rel_path.len > 0 {
+			if rel_path.ends_with('/') { rel_path + e } else { rel_path + '/' + e }
+		} else {
+			e
+		}
+
+		// For directories, also check with trailing slash
+		is_directory := os.is_dir(full)
+		mut should_ignore := ignore_matcher.is_ignored(check_path)
+		if is_directory && !should_ignore {
+			// Also check directory pattern with trailing slash
+			should_ignore = ignore_matcher.is_ignored(check_path + '/')
+		}
+
+		// Check if this entry should be ignored
+		if should_ignore {
+			continue
+		}
+
+		if is_directory {
+			out << DirItem{
+				name: e
+				typ:  'directory'
+			}
+		} else if os.is_file(full) {
+			out << DirItem{
+				name: e
+				typ:  'file'
+			}
+		}
+	}
+	return out
+}
+
 // list_files_recursive recursively lists all files in a directory
 pub fn list_files_recursive(root string) []string {
 	mut out := []string{}

lib/develop/heroprompt/heroprompt_workspace.v

@@ -222,7 +222,9 @@ pub:
 }
 
 pub fn (wsp &Workspace) list_dir(rel_path string) ![]ListItem {
-	items := codewalker.list_directory(wsp.base_path, rel_path)!
+	// Create an ignore matcher with default patterns
+	ignore_matcher := codewalker.gitignore_matcher_new()
+	items := codewalker.list_directory_filtered(wsp.base_path, rel_path, &ignore_matcher)!
 	mut out := []ListItem{}
 	for item in items {
 		out << ListItem{