Rename runtime event observers

[ollieatkinson]

Renames runtime event observation APIs away from subscription terminology and updates the SwiftUI event modifier lifecycle.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR renames the runtime event observation API surface from “subscription” terminology to “observer” terminology, and updates the SwiftUI View event modifier implementation to use the new observation model.

Changes:

• Renames Events.then → Events.handler, and subscribe(...) → on(...), introducing Events.Observer / EventObserver.
• Updates SwiftUI View APIs from onEvent / onEvents to on(...) overloads and rewrites the modifier lifecycle to be task-based.
• Updates and renames tests and builder utilities to match the new “observer” naming and behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Tests/SwiftLexiconTests/SwiftUISupportTests.swift	Updates SwiftUI modifier usage from onEvent(s) to new on(...) overloads.
Tests/SwiftLexiconTests/SwiftLexicon™.swift	Renames handler construction from then to handler.
Tests/SwiftLexiconTests/EventSubscriptionSetBuilderTests.swift	Removes old subscription builder tests (superseded by observer naming).
Tests/SwiftLexiconTests/EventObserverTests.swift	Renames/expands tests to cover the new on(...) observer API and semantics.
Tests/SwiftLexiconTests/EventObserverSetBuilderTests.swift	Adds tests for the renamed observer set result builder.
Sources/SwiftLexicon/SwiftUI.swift	Replaces onEvent(s) APIs with on(...) and rewrites the SwiftUI modifier to use task-driven observation.
Sources/SwiftLexicon/Events.swift	Introduces Events.Observer and new on(...) APIs; renames then → handler; updates operators to return observers.
Sources/SwiftLexicon/EventObserverSetBuilder.swift	Renames the result builder/types from subscription-oriented to observer-oriented.

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