[riasvdv]

Description

#20641 made long-lived processes (Octane workers and the stdio MCP server) reload the project config before each operation. The services that hold records built from it still kept what they had loaded, so configuration_get returned stale records. The revision came from the fresh project config, so an update with a current expectedRevision passed and saved the stale values over changes made in the control panel or CLI.

PrepareCraftForNextOperation::prepare() now refreshes those services as well:

 PrepareCraftForNextOperation::prepare()
   ProjectConfig::reset()
+  Fields::refreshFields()
+  EntryTypes::refreshEntryTypes()
+  Volumes::reset()
+  SiteGroups::refreshGroups()
+  ImageTransforms::reset()
   Cms::setDefaultTimezone()
   ProjectConfigRoutes::refresh()

Sections, sites, and routes are already scoped or refreshed.

Evidence

New test in tests/Feature/Mcp/StdioTest.php:

serve: create field → get → (another process sets its instructions) → get → update name
expect second get shows the outside instructions
expect update succeeds and keeps the outside instructions

• Before (6.x): Failed asserting that null is identical to 'Changed elsewhere', and the update saved instructions: null.
  After: passes. Also passing: tests/Feature/Mcp (370), OctaneWorkerTest, and composer ci.

Before this rebase, a real craft:mcp:serve process with craft:project-config:set run between messages also showed stale entry types, site groups, and volumes.

Related issues

• [6.x]: Stdio MCP server doesn't see project config changes made in the CP or CLI, then overwrites them or rejects every update #20568

[linear-code]

CMS-2657

[github-actions]

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[Copilot]

🟢 Approval recommended

No active review issues remain for the changes that refresh project configuration between stdio requests.

No open issues 🎉

What changed in this PR

Refreshes project-config state between requests in long-running stdio MCP sessions, addressing the stale reads, overwritten external changes, and persistent write failures reported in #20568.

Changes:

• Clears facade and once() caches, resets loaded project config, and refreshes cached configuration records for each request.
• Adds a regression test that simulates external changes between messages and checks fresh values, updated revisions, and preservation of those changes when saving.

File	Description
tests/​Feature/​Mcp/​StdioTest.php	Adds between-message change simulation and assertions for configuration freshness and safe updates.
src/​Mcp/​StdioEventDispatcher.php	Resets request-local state and configuration caches before processing each stdio request.

_{Review effort: Balanced}