feat(coding-agent): add --skills CLI flag for filtering skills

Adds glob pattern support for skill filtering:
- --skills <patterns> CLI flag (comma-separated glob patterns)
- includeSkills setting in settings.json
- ignoredSkills now supports glob patterns
- ignoredSkills takes precedence over includeSkills and --skills

Closes #268

packages/coding-agent/test/skills.test.ts

@@ -258,6 +258,34 @@ describe("skills", () => {
 			expect(skills).toHaveLength(0);
 		});
 
+		it("should support glob patterns in ignoredSkills", () => {
+			const { skills } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+				ignoredSkills: ["valid-*"],
+			});
+			expect(skills.every((s) => !s.name.startsWith("valid-"))).toBe(true);
+		});
+
+		it("should have ignoredSkills take precedence over includeSkills", () => {
+			const { skills } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+				includeSkills: ["valid-*"],
+				ignoredSkills: ["valid-skill"],
+			});
+			// valid-skill should be excluded even though it matches includeSkills
+			expect(skills.every((s) => s.name !== "valid-skill")).toBe(true);
+		});
+
 		it("should expand ~ in customDirectories", () => {
 			const homeSkillsDir = join(homedir(), ".pi/agent/skills");
 			const { skills: withTilde } = loadSkills({
@@ -289,6 +317,67 @@ describe("skills", () => {
 			});
 			expect(skills).toHaveLength(0);
 		});
+
+		it("should filter skills with includeSkills glob patterns", () => {
+			// Load all skills from fixtures
+			const { skills: allSkills } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+			});
+			expect(allSkills.length).toBeGreaterThan(0);
+
+			// Filter to only include "valid-skill"
+			const { skills: filtered } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+				includeSkills: ["valid-skill"],
+			});
+			expect(filtered).toHaveLength(1);
+			expect(filtered[0].name).toBe("valid-skill");
+		});
+
+		it("should support glob patterns in includeSkills", () => {
+			const { skills } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+				includeSkills: ["valid-*"],
+			});
+			expect(skills.length).toBeGreaterThan(0);
+			expect(skills.every((s) => s.name.startsWith("valid-"))).toBe(true);
+		});
+
+		it("should return all skills when includeSkills is empty", () => {
+			const { skills: withEmpty } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+				includeSkills: [],
+			});
+			const { skills: withoutOption } = loadSkills({
+				enableCodexUser: false,
+				enableClaudeUser: false,
+				enableClaudeProject: false,
+				enablePiUser: false,
+				enablePiProject: false,
+				customDirectories: [fixturesDir],
+			});
+			expect(withEmpty.length).toBe(withoutOption.length);
+		});
 	});
 
 	describe("collision handling", () => {