Add grapho CLI with improved UX

New CLI features:
- One-liner health check as default (grapho)
- Component status dashboard (grapho status)
- Verbose mode with details (grapho status -v)
- System diagnostics with fix commands (grapho doctor)
- Machine-readable output (grapho --json)
- Actionable fix suggestions for all warnings/errors

Also adds documentation:
- docs/MARKDOWN-EDITORS.md - Editor recommendations for mobile/desktop
- docs/LUX-LIMITATIONS.md - Tracking Lux language issues

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -20,7 +38,42 @@
         "type": "github"
       }
     },
+    "lux": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1771221263,
+        "narHash": "sha256-Av4s4pelV+ueIMSY61aHuT8KjKZ6ekXtJsnjVc89gtQ=",
+        "path": "/home/blu/src/lux",
+        "type": "path"
+      },
+      "original": {
+        "path": "/home/blu/src/lux",
+        "type": "path"
+      }
+    },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 1770841267,
         "narHash": "sha256-9xejG0KoqsoKEGp2kVbXRlEYtFFcDTHjidiuX8hGO44=",
@@ -39,10 +92,29 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs",
+        "lux": "lux",
+        "nixpkgs": "nixpkgs_2",
         "sops-nix": "sops-nix"
       }
     },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1770952264,
+        "narHash": "sha256-CjymNrJZWBtpavyuTkfPVPaZkwzIzGaf0E/3WgcwM14=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "ec6a3d5cdf14bb5a1dd03652bd3f6351004d2188",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
     "sops-nix": {
       "inputs": {
         "nixpkgs": [
@@ -62,6 +134,21 @@
         "repo": "sops-nix",
         "type": "github"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",