Add Technical_Decomp_JinjaTurtle

Technical_Decomp_JinjaTurtle.md

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+## enroll/jinjaturtle.py
+
+### JinjifyResult (frozen dataclass)
+
+#### Purpose: result of running the external jinjaturtle CLI tool on a config file.
+
+#### Fields:
+
+- template_text: Jinja2 template content
+- vars_text: YAML mapping text (no leading --- expected)
+
+#### Lifecycle / where it’s used:
+
+- manifest._jinjify_managed_files() calls run_jinjaturtle(...).
+- If successful:
+    - template is written into roles/<role>/templates/<src_rel>.j2
+    - vars are merged into role defaults (single-site) or host_vars (multi-site)
+- If jinjaturtle fails for a file, it silently skips templating that file (manifest remains optimistic/non-interactive).