refactor: reorganize, add package (opencode, osgrep, beads), add ai agent shell

shells/ai-agent.nix

@@ -0,0 +1,98 @@
+{ pkgs, lib, customPkgs, ... }:
+
+let
+  # Get Beads package from custom packages
+  beadsPkg = customPkgs.beads;
+
+  # Helper script to show Beads project status
+  beadsStatus = pkgs.writeShellScriptBin "beads-status" ''
+    if [ ! -d ".beads" ]; then
+      echo "Not a Beads project (no .beads directory found)"
+      exit 1
+    fi
+
+    echo "=== Beads Project Status ==="
+    echo ""
+    echo "Ready tasks:"
+    ${beadsPkg}/bin/bd ready --json | ${pkgs.jq}/bin/jq -r '.[] | "  - [\(.id)] \(.title) (\(.type))"'
+    echo ""
+    echo "In Progress:"
+    ${beadsPkg}/bin/bd list --status in-progress --json | ${pkgs.jq}/bin/jq -r '.[] | "  - [\(.id)] \(.title)"'
+    echo ""
+    echo "For full details, run: bd list --json | jq"
+  '';
+
+  # Helper script to generate full project context for AI agents
+  beadsContext = pkgs.writeShellScriptBin "beads-context" ''
+    if [ ! -d ".beads" ]; then
+      echo "Not a Beads project (no .beads directory found)"
+      exit 1
+    fi
+
+    echo "=== Beads Project Context ==="
+    echo ""
+    echo "All issues:"
+    ${beadsPkg}/bin/bd list --json | ${pkgs.jq}/bin/jq '.'
+    echo ""
+    echo "Dependency tree (first ready task):"
+    ready_id=$(${beadsPkg}/bin/bd ready --json | ${pkgs.jq}/bin/jq -r '.[0].id // empty')
+    if [ -n "$ready_id" ]; then
+      ${beadsPkg}/bin/bd dep tree "$ready_id"
+    else
+      echo "No ready tasks"
+    fi
+  '';
+
+in pkgs.mkShell {
+  name = "ai-agent";
+
+  packages = with pkgs; [
+    # Custom packages
+    customPkgs.beads
+    customPkgs.osgrep
+
+    # Version control
+    git
+    jujutsu
+
+    # Code search and navigation
+    ripgrep
+    ast-grep
+    fzf
+
+    # JSON processing
+    jq
+
+    # Helper scripts
+    beadsStatus
+    beadsContext
+  ];
+
+  shellHook = ''
+    # Add home-manager binaries to PATH (claude-code, codex, etc.)
+    if [ -d "$HOME/.nix-profile/bin" ]; then
+      export PATH="$HOME/.nix-profile/bin:$PATH"
+    fi
+
+    echo "AI Agent development shell loaded"
+    echo ""
+    echo "Available tools:"
+    echo "  bd              - Beads CLI (issue tracker)"
+    echo "  beads-status    - Show project status summary"
+    echo "  beads-context   - Generate full context for AI"
+    echo "  osgrep          - Semantic code search"
+    echo "  jj/git          - Version control"
+    echo "  rg/ast-grep     - Code search"
+    echo ""
+    echo "Quick start:"
+    echo "  bd init         - Initialize Beads in current project"
+    echo "  bd create       - Create new issue"
+    echo "  bd ready        - Show ready tasks"
+    echo "  bd --help       - Full command reference"
+    echo ""
+    echo "Nushell helpers (if in nushell):"
+    echo "  bd-init         - Safe init with git checks"
+    echo "  bd-ready        - View ready tasks (structured)"
+    echo "  bd-sync         - Sync database with git"
+  '';
+}