docs(openspec): add reporting API contract documentation

Add comprehensive API documentation for the reporting endpoint:
- Request/response structure
- View type inference (did/is/will)
- Blank vs explicit zero semantics
- Status values and error responses

Related to enhanced-allocation change.

.opencode/package-lock.json

@@ -5,26 +5,30 @@
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     "": {
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-        "@opencode-ai/plugin": "1.2.6",
-        "@th0rgal/ralph-wiggum": "^1.2.1"
+        "@opencode-ai/plugin": "1.2.14",
+        "@th0rgal/ralph-wiggum": "^1.2.2"
       }
     },
     "node_modules/@opencode-ai/plugin": {
-      "version": "1.2.6",
+      "version": "1.2.14",
+      "resolved": "https://registry.npmjs.org/@opencode-ai/plugin/-/plugin-1.2.14.tgz",
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       "license": "MIT",
       "dependencies": {
-        "@opencode-ai/sdk": "1.2.6",
+        "@opencode-ai/sdk": "1.2.14",
         "zod": "4.1.8"
       }
     },
     "node_modules/@opencode-ai/sdk": {
-      "version": "1.2.6",
+      "version": "1.2.14",
+      "resolved": "https://registry.npmjs.org/@opencode-ai/sdk/-/sdk-1.2.14.tgz",
+      "integrity": "sha512-nPkWAmzgPJYyfCJAV4NG7HTfN/iuO3B6fv8sT26NhPiR+EqD9i8sh4X1LwI7wEbbMOwWOX1PhrssW6gXQOOQZQ==",
       "license": "MIT"
     },
     "node_modules/@th0rgal/ralph-wiggum": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/@th0rgal/ralph-wiggum/-/ralph-wiggum-1.2.1.tgz",
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+      "resolved": "https://registry.npmjs.org/@th0rgal/ralph-wiggum/-/ralph-wiggum-1.2.2.tgz",
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       "license": "MIT",
       "bin": {
         "ralph": "bin/ralph.js"