feat: Add GitHub Codespaces cloud provider with claude, aider, gptme (#248)

Add GitHub Codespaces as a new cloud provider via gh CLI:
- github-codespaces/lib/common.sh - provisioning primitives via gh CLI
- github-codespaces/claude.sh - Claude Code implementation
- github-codespaces/aider.sh - Aider implementation
- github-codespaces/gptme.sh - gptme implementation
- github-codespaces/README.md - usage documentation
- manifest.json - added cloud entry and matrix entries

Pricing: Pay-as-you-go starting at $0.18/hr (2 core, 4GB RAM)
Free tier available for personal accounts.

Agent: cloud-scout

Co-authored-by: B <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

github-codespaces/gptme.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+set -eo pipefail
+
+# Source common functions - try local file first, fall back to remote
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" 2>/dev/null && pwd)"
+if [[ -f "$SCRIPT_DIR/lib/common.sh" ]]; then
+    source "$SCRIPT_DIR/lib/common.sh"
+else
+    eval "$(curl -fsSL https://raw.githubusercontent.com/OpenRouterTeam/spawn/main/github-codespaces/lib/common.sh)"
+fi
+
+log_info "gptme on GitHub Codespaces"
+echo ""
+
+# 1. Ensure gh CLI and authentication
+ensure_gh_cli
+ensure_gh_auth
+
+# 2. Get repository and create codespace
+REPO="${GITHUB_REPO:-OpenRouterTeam/spawn}"
+MACHINE="${CODESPACE_MACHINE:-basicLinux32gb}"
+IDLE_TIMEOUT="${CODESPACE_IDLE_TIMEOUT:-30m}"
+
+log_info "Creating codespace for repo: $REPO"
+CODESPACE=$(create_codespace "$REPO" "$MACHINE" "$IDLE_TIMEOUT")
+
+if [[ -z "$CODESPACE" ]]; then
+    log_error "Failed to create codespace"
+    exit 1
+fi
+
+log_info "Codespace created: $CODESPACE"
+
+# 3. Wait for codespace to be ready
+wait_for_codespace "$CODESPACE"
+
+# 4. Install gptme
+log_warn "Installing gptme..."
+run_in_codespace "$CODESPACE" "pip install gptme 2>/dev/null || pip3 install gptme"
+log_info "gptme installed"
+
+# 5. Get OpenRouter API key
+echo ""
+if [[ -n "${OPENROUTER_API_KEY:-}" ]]; then
+    log_info "Using OpenRouter API key from environment"
+else
+    OPENROUTER_API_KEY=$(get_openrouter_api_key_oauth 5180)
+fi
+
+# 6. Get model preference
+MODEL_ID=$(get_model_id_interactive "openrouter/auto" "gptme") || exit 1
+
+# 7. Inject environment variables into ~/.bashrc
+log_warn "Setting up environment variables..."
+
+ENV_VARS="
+export OPENROUTER_API_KEY='${OPENROUTER_API_KEY}'
+"
+
+run_in_codespace "$CODESPACE" "cat >> ~/.bashrc << 'ENVEOF'
+$ENV_VARS
+ENVEOF"
+
+echo ""
+log_info "GitHub Codespace setup completed successfully!"
+log_info "Codespace: $CODESPACE"
+echo ""
+
+# 8. Start gptme interactively
+log_warn "Starting gptme..."
+log_warn "To delete codespace later, run: gh codespace delete --codespace $CODESPACE --force"
+echo ""
+sleep 1
+
+# Launch gptme with model
+run_in_codespace "$CODESPACE" "source ~/.bashrc && gptme -m openrouter/${MODEL_ID}"