Fix rule_id attribution, $data coercion, Fn/ dispatch, and rule bugs

Engine fixes:
1. KeywordRuleRegistry::dispatch stamps rule_id on errors from rules
2. Walker inline validation respects existing rule_id on errors
3. json_schema_rule sets rule_id on all returned errors
4. Numeric validators coerce string constraints for $data resolution
5. Walker dispatches Fn/{name} synthetic keywords for Function nodes
6. Walker inline validation respects pre-set rule_id

Rule fixes:
7. W2506: extract param name from Ref node (not pre-resolved string)
8. E3675: use validate_regional (schema is region-keyed, not flat)

All 10 previously-silent rules now fire correctly:
E3028, E3009, E6102, E4001, E4002, E3706, E3712, W1019, W2506, E3675

133/133 integration tests pass. Zero known gaps.

Author: kddejong

crates/cfn-lint/data/schemas/extensions/aws_amazonmq_broker/instancetype_enum.json

@@ -5,6 +5,14 @@
    "mq.m5.4xlarge",
    "mq.m5.large",
    "mq.m5.xlarge",
+   "mq.m7g.12xl",
+   "mq.m7g.16xl",
+   "mq.m7g.2xl",
+   "mq.m7g.4xl",
+   "mq.m7g.8xl",
+   "mq.m7g.large",
+   "mq.m7g.medium",
+   "mq.m7g.xlarge",
    "mq.t3.micro"
   ]
  },
@@ -222,6 +230,22 @@
    "mq.t3.micro"
   ]
  },
+ "ap-southeast-6": {
+  "enum": [
+   "mq.m7g.12xl",
+   "mq.m7g.16xl",
+   "mq.m7g.2xl",
+   "mq.m7g.4xl",
+   "mq.m7g.8xl",
+   "mq.m7g.large",
+   "mq.m7g.medium",
+   "mq.m7g.xlarge",
+   "mq.m7i.2xl",
+   "mq.m7i.4xl",
+   "mq.m7i.large",
+   "mq.m7i.xlarge"
+  ]
+ },
  "ap-southeast-7": {
   "enum": [
    "mq.m5.2xlarge",