docs: name tools and error codes the way the client sees them

Indirect abilities are written lit/<name> (via mcp-adapter-execute-ability) in
guides, descriptions and hints, direct tools lit-<name>; guides use the
client-visible codes (write_failed, partial_write) and say exactly which tools
return a revision_id. ToolNamingTest keeps guides and sources consistent with
Ability::isDirect() and checks the overview's direct-tool list.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

docs/guides/overview.md

@@ -20,7 +20,8 @@ des verbundenen WordPress-Benutzers.
 Direkt sichtbar: `lit-guide`, `lit-site-status`, `lit-content-types`, `lit-content-query`,
 `lit-content-get`, `lit-content-create`, `lit-content-update`, `lit-post-publish`.
 
-Über `mcp-adapter-discover-abilities` / `mcp-adapter-execute-ability` (Ability-Namen `lit/…`):
+Über `mcp-adapter-discover-abilities` / `mcp-adapter-execute-ability` (Ability-Namen `lit/…`; in Guides und
+Hinweisen immer so geschrieben):
 Status (`lit/post-unpublish`, `lit/post-schedule`, `lit/post-trash`), Kopien (`lit/post-duplicate`,
 `lit/post-replace-with-copy`), Revisionen (`lit/revisions-list`, `lit/revision-restore`), Menüs
 (`lit/menu-list`, `lit/menu-get`, `lit/menu-create`, `lit/menu-set-items`, `lit/menu-assign-location`),
@@ -30,6 +31,8 @@ Weitere Themen: `lit-guide` mit `topic` = `content-types` oder `workflows`.
 
 ## Rückmeldungen
 
-- Erfolg: `ok`, `summary`, `changed`, `warnings`, `revision_id` (Stand vorher), `log_id`, URLs.
-- Fehler: JSON mit `code`, `message`, `hint` (und ggf. `fields`). Dem `hint` folgen.
+- Erfolg: `ok`, `summary`, `changed`, `warnings`, `rev`, `revision_id` (Revision mit dem Stand vorher, nur bei
+  Tools, die Inhalt überschreiben, sonst `null`), `log_id`, URLs.
+- Fehler: JSON mit `code` (z. B. `validation_failed`, `rev_mismatch`, `write_failed`, `partial_write`),
+  `message`, `hint` (und ggf. `fields`). Dem `hint` folgen.
 - `confirm_required`: Nutzer fragen, dann mit `confirm: true` wiederholen.