feat: support .agents/skills/ directory for cross-agent skill discovery (#9966)

Adds loading from two .agents/skills/ locations:
- ~/.agents/skills/ (personal/user-level, source "agents-skills-personal")
- {workspace}/.agents/skills/ (project-level, source "agents-skills-project")

Precedence: extra < bundled < managed < personal .agents/skills < project .agents/skills < workspace.

Closes #8822

src/agents/skills/workspace.ts

@@ -4,6 +4,7 @@ import {
   type Skill,
 } from "@mariozechner/pi-coding-agent";
 import fs from "node:fs";
+import os from "node:os";
 import path from "node:path";
 import type { OpenClawConfig } from "../../config/config.js";
 import type {
@@ -121,7 +122,7 @@ function loadSkillEntries(
   };
 
   const managedSkillsDir = opts?.managedSkillsDir ?? path.join(CONFIG_DIR, "skills");
-  const workspaceSkillsDir = path.join(workspaceDir, "skills");
+  const workspaceSkillsDir = path.resolve(workspaceDir, "skills");
   const bundledSkillsDir = opts?.bundledSkillsDir ?? resolveBundledSkillsDir();
   const extraDirsRaw = opts?.config?.skills?.load?.extraDirs ?? [];
   const extraDirs = extraDirsRaw
@@ -150,13 +151,23 @@ function loadSkillEntries(
     dir: managedSkillsDir,
     source: "openclaw-managed",
   });
+  const personalAgentsSkillsDir = path.resolve(os.homedir(), ".agents", "skills");
+  const personalAgentsSkills = loadSkills({
+    dir: personalAgentsSkillsDir,
+    source: "agents-skills-personal",
+  });
+  const projectAgentsSkillsDir = path.resolve(workspaceDir, ".agents", "skills");
+  const projectAgentsSkills = loadSkills({
+    dir: projectAgentsSkillsDir,
+    source: "agents-skills-project",
+  });
   const workspaceSkills = loadSkills({
     dir: workspaceSkillsDir,
     source: "openclaw-workspace",
   });
 
   const merged = new Map<string, Skill>();
-  // Precedence: extra < bundled < managed < workspace
+  // Precedence: extra < bundled < managed < agents-skills-personal < agents-skills-project < workspace
   for (const skill of extraSkills) {
     merged.set(skill.name, skill);
   }
@@ -166,6 +177,12 @@ function loadSkillEntries(
   for (const skill of managedSkills) {
     merged.set(skill.name, skill);
   }
+  for (const skill of personalAgentsSkills) {
+    merged.set(skill.name, skill);
+  }
+  for (const skill of projectAgentsSkills) {
+    merged.set(skill.name, skill);
+  }
   for (const skill of workspaceSkills) {
     merged.set(skill.name, skill);
   }