Infer deterministic IDs for rule modules (triggers, on_load)

[Copilot]

Triggers and the on_load module were assigned random UUIDs, making them opaque in logs and tooling. This replaces random UUIDs with IDs derived from the rule's UID.

Changes

• Trigger IDs: Each trigger now gets an ID of {rule_uid}:{n} where n is a 1-based sequential counter scoped to the rule. Falls back to a random UUID only when no rule UID is present in thread context (edge case).
• on_load module ID: Uses {rule_uid}:on_load instead of a random UUID. Same fallback applies.

Example

rule id: "my_rule" do
  changed SomeSwitch   # trigger id → "my_rule:1"
  changed OtherSwitch  # trigger id → "my_rule:2"
  on_load              # on_load module id → "my_rule:on_load"
  run { nil }
end

This makes module IDs human-readable and stable across script reloads, consistent with how rule IDs are already inferred from source location.