feat(rah-light): replace workflows with guides system

- Remove entire workflow system (API routes, services, tools, components)
- Add guides system from main ra-h repo (for external agent integration)
- Update pane types: 'workflows' → 'guides' throughout
- Update LeftToolbar to show guides icon instead of workflows
- Update SettingsModal with GuidesViewer tab
- Add GuidesPane for browsing guides in main UI
- Clean up prompts to remove workflow references
- Update tool registry to remove workflow tools
- Add gray-matter package for frontmatter parsing

Guides are essential for RA-H Light as they help external agents
(via MCP) understand the knowledge base context and usage patterns.

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

package-lock.json

@@ -16,6 +16,7 @@
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         "next": "15.1.3",
         "openai": "^4.103.0",
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+        "kind-of": "^6.0.2",
+        "section-matter": "^1.0.0",
+        "strip-bom-string": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6.0"
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+    "node_modules/gray-matter/node_modules/argparse": {
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+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "sprintf-js": "~1.0.2"
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+    "node_modules/gray-matter/node_modules/js-yaml": {
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+      "license": "MIT",
+      "dependencies": {
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+        "esprima": "^4.0.0"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
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@@ -6100,6 +6163,15 @@
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+    "node_modules/is-extendable": {
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+      "license": "MIT",
+      "engines": {
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+      }
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@@ -6526,6 +6598,15 @@
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+      "license": "MIT",
+      "engines": {
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+    },
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       "license": "MIT"
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+    "node_modules/section-matter": {
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+      "resolved": "https://registry.npmjs.org/section-matter/-/section-matter-1.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "extend-shallow": "^2.0.1",
+        "kind-of": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
@@ -9418,6 +9512,12 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
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+    },
     "node_modules/stable-hash": {
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       "resolved": "https://registry.npmjs.org/stable-hash/-/stable-hash-0.0.5.tgz",
@@ -9620,6 +9720,15 @@
         "node": ">=4"
       }
     },
+    "node_modules/strip-bom-string": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom-string/-/strip-bom-string-1.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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