feat(mindspace): add page quota grace write and local delivery guardrails.

Centralize page HTML quota checks with grace-write semantics across page
services and workspace tools, keep localhost MindSpace links clickable in
chat display, and expand Page Data/static-page skill plus local dev docs
for quota, delivery URLs, and native Aider/OpenHands tooling.

Co-authored-by: Cursor <cursoragent@cursor.com>

mindspace-workspace-tool-service.mjs

@@ -13,6 +13,10 @@ import {
 import {
   UPLOAD_ZONE_CODES,
 } from './user-space.mjs';
+import {
+  assertPageWriteQuotaForUser,
+  isMindSpacePageWriteRelativePath,
+} from './mindspace-space-quota.mjs';
 
 function workspaceToolError(message, code) {
   return Object.assign(new Error(message), { code });
@@ -330,6 +334,9 @@ export function createMindSpaceWorkspaceToolService({
   maxBinaryWriteBytes = 8 * 1024 * 1024,
   maxGeneratedBinaryBytes =
     40 * 1024 * 1024,
+  assertPageWriteQuotaForUserFn =
+    assertPageWriteQuotaForUser,
+  getQuotaPool = null,
 } = {}) {
   if (!h5Root) {
     throw new Error(
@@ -395,6 +402,23 @@ export function createMindSpaceWorkspaceToolService({
     };
   };
 
+  const ensurePageWriteAllowed = async ({
+    userId,
+    relativePath,
+    requiredBytes,
+  }) => {
+    if (
+      !getQuotaPool ||
+      typeof assertPageWriteQuotaForUserFn !== 'function' ||
+      !isMindSpacePageWriteRelativePath(relativePath)
+    ) {
+      return;
+    }
+    const pool = getQuotaPool();
+    if (!pool) return;
+    await assertPageWriteQuotaForUserFn(pool, userId, requiredBytes);
+  };
+
   const registerWrite = async ({
     scope,
     relativePath,
@@ -523,6 +547,11 @@ export function createMindSpaceWorkspaceToolService({
         content,
         { relativePath },
       );
+      await ensurePageWriteAllowed({
+        userId: scope.userId,
+        relativePath,
+        requiredBytes: sizeBytes,
+      });
       const target =
         await resolveWritableWorkspacePath(
           scope.workspaceRoot,
@@ -620,6 +649,12 @@ export function createMindSpaceWorkspaceToolService({
         updated,
         { relativePath },
       );
+      const originalSizeBytes = mimeSafeByteLength(original);
+      await ensurePageWriteAllowed({
+        userId: scope.userId,
+        relativePath,
+        requiredBytes: Math.max(0, sizeBytes - originalSizeBytes),
+      });
       await fs.writeFile(target, updated, 'utf8');
       const registration = await registerWrite({
         scope,