new struct md files

patch_history/RETRIEX_PATCH_12_DEVELOPER_POLICIES_README.md

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+# RetrieX Patch 12 - Developer Policies after YAML-only Migration
+
+This patch does not continue the YAML-only migration and does not enable strict validation.
+
+Patch 1 through 11.0a are treated as the completed YAML-only migration baseline. Patch 12 documents the developer rules that must be followed from now on to prevent regressions and new PHP-only configuration drift.
+
+## Scope
+
+Changed files:
+
+- `DEVELOPER_POLICIES.md`
+- `README.md`
+- `COMMAND_REF.md`
+
+## What changed
+
+### Developer policies
+
+Added a binding policy document with rules for:
+
+- YAML as source of truth
+- no new PHP-only defaults
+- no hardcoded semantic lists in core code
+- fallback restrictions
+- mandatory pre-merge checks
+- protected regression baseline
+- deferred strict validation
+- PR checklist
+
+### README
+
+The README now points developers to `DEVELOPER_POLICIES.md` and lists the config-governance commands together with the other important commands.
+
+The previously open final bash code block in the README was also closed while appending the policy section.
+
+### Command reference
+
+`COMMAND_REF.md` now includes the existing config/governance commands:
+
+- `mto:agent:config:validate`
+- `mto:agent:config:audit-source`
+- `mto:agent:config:dump-effective`
+- `mto:agent:regression:test`
+
+## Intentional non-changes
+
+No PHP runtime behavior was changed.
+No retrieval, prompt, shop, agent, SSE, audit or validation logic was changed.
+Strict YAML validation remains deferred and disabled.
+
+## Recommended validation
+
+```bash
+php bin/console cache:clear
+php bin/console mto:agent:config:validate
+php bin/console mto:agent:config:audit-source --details
+php bin/console mto:agent:regression:test
+```
+
+In this ZIP work environment, `vendor/` is not included, so Symfony console commands may need to be run in the real project checkout after dependencies are installed.