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

tests/Unit/Abilities/ErrorsTest.php

@@ -76,7 +76,8 @@ final class ErrorsTest extends TestCase
         self::assertStringContainsString('Eintrag 5', $payload['message']);
         self::assertStringContainsString('Revision 811', $payload['message']);
         self::assertStringContainsString('lit-content-get', $payload['hint']);
-        self::assertStringContainsString('lit-revisions-list', $payload['hint']);
+        self::assertStringContainsString('lit/revisions-list', $payload['hint']);
+        self::assertStringContainsString('mcp-adapter-execute-ability', $payload['hint']);
         self::assertStringContainsString('nicht einfach wiederholen', $payload['hint']);
         self::assertSame(5, $payload['post_id']);
         self::assertSame(811, $payload['revision_id']);