fix: Resolve relative paths from cwd instead of git root

The linter was resolving relative paths from the git repository root
instead of the current working directory, causing relative paths like
'../skills/ui5-best-practices' to fail.

Changed both resolveSkillPaths() and validateSkillPath() to:
1. Resolve paths from process.cwd() (for relative paths)
2. Use git root only for workspace boundary validation

This matches standard CLI tool behavior where relative paths are
resolved from the user's current directory.

Fixes:
- 'npm test && node bin/skill-lint.js lint ../skills/ui5-best-practices'
- Multi-skill mode: 'node bin/skill-lint.js lint ../skills/'
- All relative path scenarios

Absolute paths continue to work as before.

Author: d3xter666

plugins/ui5/skill-lint/src/cli/commands/lint.ts

@@ -119,13 +119,20 @@ async function resolveSkillPaths(skillPath: string): Promise<string[]> {
     throw new Error(`Invalid skill path: ${error instanceof Error ? error.message : String(error)}`);
   }
 
-  const workspaceRoot = await findGitRoot() || process.cwd();
-  const resolved = resolve(workspaceRoot, sanitized);
+  // Resolve from cwd (for relative paths) or as-is (for absolute paths)
+  const resolved = resolve(process.cwd(), sanitized);
 
   if (!existsSync(resolved)) {
     throw new Error(`Skill path does not exist: ${skillPath}`);
   }
 
+  // Validate that resolved path is within workspace
+  const workspaceRoot = await findGitRoot() || process.cwd();
+  const rel = relative(workspaceRoot, resolved);
+  if (rel.startsWith('..') || isAbsolute(rel)) {
+    throw new Error(`Skill path must be within workspace: ${skillPath}`);
+  }
+
   // If it's a file, treat as single skill
   const stats = await stat(resolved);
   if (stats.isFile()) {
@@ -173,9 +180,8 @@ async function validateSkillPath(skillPath: string): Promise<string> {
     throw new Error(`Invalid skill path: ${error instanceof Error ? error.message : String(error)}`);
   }
 
-  // Use git root as workspace root if available, otherwise cwd
-  const workspaceRoot = await findGitRoot() || process.cwd();
-  const resolved = resolve(workspaceRoot, sanitized);
+  // Resolve from cwd (for relative paths) or as-is (for absolute paths)
+  const resolved = resolve(process.cwd(), sanitized);
 
   // Check if path exists
   if (!existsSync(resolved)) {
@@ -191,6 +197,7 @@ async function validateSkillPath(skillPath: string): Promise<string> {
   }
 
   // Ensure path is within workspace (prevents path traversal)
+  const workspaceRoot = await findGitRoot() || process.cwd();
   const rel = relative(workspaceRoot, realPath);
   if (rel.startsWith('..') || isAbsolute(rel)) {
     throw new Error(`Skill path must be within workspace: ${skillPath}`);