[Madraka]

RFC-0040 / ADR-0042, step 4 of 4. Stacked on #85; independent of the Studio PR #86.

• list_collections (content:read, read-only): the registry with names per locale, icon, entry counts by status, effective permalink, feed/sitemap/sort with defaults filled in, and the taxonomies that apply.
• create_collection and update_collection:
  • site:write, requiresApproval, approverScopes: ["site:settings"], and classify that is person in every mode (bypass included) or read for dryRun. This is the same policy as set_collection_permalink.
  • The precheck refuses these before anyone is asked:
    • an overlap (path_conflict / reserved_path, via the store's dry-run site update);
    • an existing declared key (collection_exists);
    • an unknown collection for update (collection_undeclared);
    • a missing default-locale name, and more than 50 collections.
  • The approval text names the key, the labels and the address, and says the key cannot be renamed.
  • update_collection merges labels by locale; permalink changes stay with set_collection_permalink.
• create_entry: a precheck refuses a collection that is not in the registry (collection_undeclared) and says to use create_collection. Inferred collections and posts keep working. Translations create entries only in their source's collection, so they need no check.
• Server instructions are updated, the README tool reference is regenerated (node scripts/mcp-tools-doc.ts --check ok), and the new error codes have hints.
• Tests: mcp-server 150/150. The new test/collections.test.ts covers approval in every mode, dry run, the refusal before and acceptance after create_collection, overlaps, duplicates and the label merge. The pinned tool lists were updated (105 tools).
• Changeset: mcp-server, minor.

Refs #71

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