feat(ui): render per-element Template attributes

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Summary

• render wrapper attributes from a Template Dot that implements jaws.InitialHTMLAttrHandler
• keep ui.Template value-comparable by consuming attributes during initial render instead of retaining them in the Template or Element state
• define render-parameter precedence over duplicate Dot attributes and pin the emission order in a regression test
• document initial-only, wrapped-Template behavior and cover equal Template values, container children, parameters, updates, and failure paths

Behavior change

Existing Template Dots that already implement jaws.InitialHTMLAttrHandler now contribute attributes to the generated wrapper during initial render. This includes ui.Object; applications using such a Dot may therefore emit wrapper attributes where none were emitted before.

Testing

• go generate ./...
• go vet ./...
• staticcheck ./...
• golangci-lint run
• gosec ./...
• go build ./...
• JAWS_REQUIRE_NODE=1 go test -race ./...
• JAWS_REQUIRE_NODE=1 go test ./...

The optional local 386 runtime leg could not execute on this aarch64 host (exec format error); the CI build-386 job passed on the pushed head.