Add GitHub Copilot SDK as an AI provider option

.env.example

@@ -48,6 +48,41 @@ ANTHROPIC_API_KEY=your-api-key-here
 # AWS_REGION=us-east-1
 # AWS_BEARER_TOKEN_BEDROCK=your-bearer-token
 
+# =============================================================================
+# OPTION 4: GitHub Copilot
+# =============================================================================
+# Uses @github/copilot-sdk to access AI models via your GitHub Copilot subscription.
+# No Anthropic API key required — just a GitHub token from a Copilot-enabled account.
+#
+# Quick setup:
+#   ./shannon login        # Interactive login (uses gh CLI or manual token entry)
+#   ./shannon models       # List all available models
+#
+# Or set your token manually (PAT with 'copilot' scope, or GH CLI token):
+# GITHUB_TOKEN=ghp_your-github-token-here
+#
+# Alternatively:
+# GH_TOKEN=ghp_your-github-token-here
+# COPILOT_GITHUB_TOKEN=ghp_your-github-token-here
+#
+# Force Copilot mode (auto-detected when GITHUB_TOKEN set and no ANTHROPIC_API_KEY):
+# COPILOT_PROVIDER=true
+#
+# Override Copilot model selection (Claude uses Copilot SDK; GPT/Gemini/Grok use
+# the GitHub Models OpenAI-compatible API — both paths work automatically):
+# COPILOT_SMALL_MODEL=claude-haiku-4.5
+# COPILOT_MEDIUM_MODEL=claude-sonnet-4.6
+# COPILOT_LARGE_MODEL=claude-opus-4.6
+#
+# Available models (run ./shannon models for full list):
+#   Claude:  claude-haiku-4.5, claude-sonnet-4, claude-sonnet-4.5, claude-sonnet-4.6,
+#            claude-opus-4.1, claude-opus-4.5, claude-opus-4.6
+#   GPT:     gpt-4o, gpt-4.1, gpt-5, gpt-5-mini, gpt-5.1, gpt-5.1-codex,
+#            gpt-5.1-codex-max, gpt-5.1-codex-mini, gpt-5.2, gpt-5.2-codex
+#   Gemini:  gemini-2.5-pro, gemini-3-flash-preview, gemini-3-pro-preview,
+#            gemini-3.1-pro-preview
+#   Other:   grok-code-fast-1
+
 # =============================================================================
 # OPTION 4: Google Vertex AI
 # =============================================================================

Dockerfile

@@ -129,6 +129,9 @@ RUN npm prune --production && \
 
 RUN npm install -g @anthropic-ai/claude-code
 
+# Install GitHub Copilot CLI (required by @github/copilot-sdk for Copilot provider mode)
+RUN npm install -g @github/copilot 2>/dev/null || true
+
 # Create directories for session data and ensure proper permissions
 RUN mkdir -p /app/sessions /app/deliverables /app/repos /app/configs && \
     mkdir -p /tmp/.cache /tmp/.config /tmp/.npm && \

docker-compose.yml

@@ -35,6 +35,15 @@ services:
       - ANTHROPIC_MEDIUM_MODEL=${ANTHROPIC_MEDIUM_MODEL:-}
       - ANTHROPIC_LARGE_MODEL=${ANTHROPIC_LARGE_MODEL:-}
       - CLAUDE_CODE_MAX_OUTPUT_TOKENS=${CLAUDE_CODE_MAX_OUTPUT_TOKENS:-64000}
+      # GitHub Copilot provider
+      - COPILOT_PROVIDER=${COPILOT_PROVIDER:-}
+      - GITHUB_TOKEN=${GITHUB_TOKEN:-}
+      - GH_TOKEN=${GH_TOKEN:-}
+      - COPILOT_GITHUB_TOKEN=${COPILOT_GITHUB_TOKEN:-}
+      - COPILOT_SMALL_MODEL=${COPILOT_SMALL_MODEL:-}
+      - COPILOT_MEDIUM_MODEL=${COPILOT_MEDIUM_MODEL:-}
+      - COPILOT_LARGE_MODEL=${COPILOT_LARGE_MODEL:-}
+      - COPILOT_LOG_LEVEL=${COPILOT_LOG_LEVEL:-warning}
     depends_on:
       temporal:
         condition: service_healthy