feat(ci): GitHub Actions workflow for skill lint enforcement

New .github/workflows/lint.yml runs scripts/lint-skills.ps1 -Strict on:
- push to master
- pull_request (any branch)
- workflow_dispatch (manual)

Uses ubuntu-latest with pre-installed pwsh (faster and cheaper than
windows-latest). Path filters limit runs to changes in skills/, the
lint script itself, or the workflow file. Concurrency group cancels
in-flight runs on the same ref.

Also add CI status and MIT License badges to README header.

Local verification: lint-skills.ps1 -Strict currently passes 24/24,
0 warnings, exit 0. The -Strict flag means CI fails on any warning,
not just errors — enforces the current clean baseline going forward
so future skill additions cannot silently degrade quality.

Author: daehounan

.github/workflows/lint.yml

@@ -0,0 +1,36 @@
+name: Lint Skills
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'skills/**'
+      - 'scripts/lint-skills.ps1'
+      - '.github/workflows/lint.yml'
+  pull_request:
+    paths:
+      - 'skills/**'
+      - 'scripts/lint-skills.ps1'
+      - '.github/workflows/lint.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: lint-skills.ps1 (strict)
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Show pwsh version
+        shell: pwsh
+        run: $PSVersionTable | Format-Table -AutoSize
+
+      - name: Run lint-skills.ps1 -Strict
+        shell: pwsh
+        run: ./scripts/lint-skills.ps1 -Strict

README.md

@@ -1,5 +1,8 @@
 # Agency Agents (Fork)
 
+[![Lint Skills](https://github.com/daehounan/agency-agents-fork/actions/workflows/lint.yml/badge.svg?branch=master)](https://github.com/daehounan/agency-agents-fork/actions/workflows/lint.yml)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
+
 A curated fork of [msitarzewski/agency-agents](https://github.com/msitarzewski/agency-agents) — **179 specialist agent personas** + **24 routing skills** (consolidated, no duplicates with existing ecc/Anthropic skills) + **1 prompt-suggestion hook** + **ecosystem-wide duplicates audit** packaged for our Claude Code + ecc plugin setup on Windows.
 
 ## What changed vs upstream