feat(github): add GitHub adapter with 5 public API commands

src/clis/github/issues.yaml

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+site: github
+name: issues
+description: List issues for a GitHub repository
+domain: github.com
+strategy: public
+browser: false
+
+args:
+  owner:
+    type: string
+    required: true
+    description: Repository owner
+  name:
+    type: string
+    required: true
+    description: Repository name
+  state:
+    type: string
+    default: open
+    description: "Issue state: open, closed, all"
+  limit:
+    type: int
+    default: 10
+    description: Number of issues
+
+pipeline:
+  - fetch:
+      url: "https://api.github.com/repos/${{ args.owner }}/${{ args.name }}/issues?state=${{ args.state }}&per_page=${{ args.limit }}"
+      headers:
+        Accept: application/vnd.github.v3+json
+        User-Agent: opencli
+
+  - filter: "!item.pull_request"
+
+  - map:
+      number: "#${{ item.number }}"
+      title: "${{ (item.title || '').substring(0, 60) }}"
+      author: "${{ item.user.login }}"
+      labels: "${{ (item.labels || []).map(l => l.name).join(', ') }}"
+      comments: ${{ item.comments }}
+      created: "${{ item.created_at?.substring(0, 10) }}"
+
+  - limit: ${{ args.limit }}
+
+columns: [number, title, author, labels, comments, created]

src/clis/github/repo.yaml

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+site: github
+name: repo
+description: GitHub repository details
+domain: github.com
+strategy: public
+browser: false
+
+args:
+  owner:
+    type: string
+    required: true
+    description: Repository owner
+  name:
+    type: string
+    required: true
+    description: Repository name
+
+pipeline:
+  - fetch:
+      url: "https://api.github.com/repos/${{ args.owner }}/${{ args.name }}"
+      headers:
+        Accept: application/vnd.github.v3+json
+        User-Agent: opencli
+
+  - map:
+      name: "${{ item.full_name }}"
+      stars: ${{ item.stargazers_count }}
+      forks: ${{ item.forks_count }}
+      issues: ${{ item.open_issues_count }}
+      language: "${{ item.language || '-' }}"
+      license: "${{ item.license?.spdx_id || '-' }}"
+      created: "${{ item.created_at?.substring(0, 10) }}"
+      updated: "${{ item.pushed_at?.substring(0, 10) }}"
+      description: "${{ (item.description || '').substring(0, 80) }}"
+
+columns: [name, stars, forks, issues, language, license, description]

src/clis/github/search.yaml

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+site: github
+name: search
+description: Search GitHub repositories
+domain: github.com
+strategy: public
+browser: false
+
+args:
+  query:
+    type: string
+    required: true
+    description: Search query
+  sort:
+    type: string
+    default: stars
+    description: "Sort by: stars, forks, updated"
+  limit:
+    type: int
+    default: 10
+    description: Number of results
+
+pipeline:
+  - fetch:
+      url: "https://api.github.com/search/repositories?q=${{ encodeURIComponent(args.query) }}&sort=${{ args.sort }}&per_page=${{ args.limit }}"
+      headers:
+        Accept: application/vnd.github.v3+json
+        User-Agent: opencli
+
+  - select: items
+
+  - map:
+      rank: ${{ index + 1 }}
+      name: "${{ item.full_name }}"
+      stars: ${{ item.stargazers_count }}
+      forks: ${{ item.forks_count }}
+      language: "${{ item.language || '-' }}"
+      description: "${{ (item.description || '').substring(0, 60) }}"
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, name, stars, forks, language, description]

src/clis/github/trending.yaml

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+site: github
+name: trending
+description: GitHub trending repositories (by recent stars)
+domain: github.com
+strategy: public
+browser: false
+
+args:
+  language:
+    type: string
+    default: ""
+    description: "Filter by language (e.g. typescript, python, rust)"
+  since:
+    type: string
+    default: daily
+    description: "Time range: daily (7 days), weekly (30 days), monthly (90 days)"
+  limit:
+    type: int
+    default: 10
+    description: Number of repositories
+
+pipeline:
+  - fetch:
+      url: "https://api.github.com/search/repositories?q=stars%3A%3E50+created%3A%3E${{ (function(){ const d=new Date(); const days={daily:7,weekly:30,monthly:90}[args.since]||7; d.setDate(d.getDate()-days); return d.toISOString().substring(0,10) })() }}${{ args.language ? '+language%3A'+args.language : '' }}&sort=stars&order=desc&per_page=${{ args.limit }}"
+      headers:
+        Accept: application/vnd.github.v3+json
+        User-Agent: opencli
+
+  - select: items
+
+  - map:
+      rank: ${{ index + 1 }}
+      name: "${{ item.full_name }}"
+      stars: ${{ item.stargazers_count }}
+      forks: ${{ item.forks_count }}
+      language: "${{ item.language || '-' }}"
+      description: "${{ (item.description || '').substring(0, 60) }}"
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, name, stars, forks, language, description]

src/clis/github/user.yaml

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+site: github
+name: user
+description: GitHub user profile
+domain: github.com
+strategy: public
+browser: false
+
+args:
+  username:
+    type: string
+    required: true
+    description: GitHub username
+
+pipeline:
+  - fetch:
+      url: "https://api.github.com/users/${{ args.username }}"
+      headers:
+        Accept: application/vnd.github.v3+json
+        User-Agent: opencli
+
+  - map:
+      login: "${{ item.login }}"
+      name: "${{ item.name || '-' }}"
+      bio: "${{ (item.bio || '').substring(0, 60) }}"
+      repos: ${{ item.public_repos }}
+      followers: ${{ item.followers }}
+      following: ${{ item.following }}
+      company: "${{ item.company || '-' }}"
+      location: "${{ item.location || '-' }}"
+      created: "${{ item.created_at?.substring(0, 10) }}"
+
+columns: [login, name, repos, followers, following, location]