context loading, path resolution, form state, dynamic rules, and provider-neutral assessment runner/cache boundary

examples/runtime/runtime-expected-diagnostics.md

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+# Runtime Expected Diagnostics
+
+These examples are meant for manual inspection and future snapshot fixtures.
+
+```text
+mkt contract check examples/runtime/workplan-done-missing-decision.md \
+  --contract examples/runtime/workplan-dynamic.contract.md \
+  --format text
+```
+
+Expected diagnostic:
+
+- `runtime.section.missing`: status `done` requires a `Decision Point` section.
+
+```text
+mkt contract check examples/runtime/business-letter-prefill.md \
+  --contract examples/contracts/business-letter.contract.md \
+  --context examples/runtime/business-letter.context.yaml \
+  --format text
+```
+
+Expected runtime utility:
+
+- `recipient_name` and `sender_name` are prefilled from context.
+- No field-missing diagnostic is emitted for those fields.