Add Observer Pattern Source Generator#119

Draft

Copilot wants to merge 13 commits intomainfrom

copilot/create-observer-pattern-generator

Commits on Feb 19, 2026

Initial plan
Copilot
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Add Observer pattern attribute definitions and enums

Copilot
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JerrettDavis
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Add initial Observer generator structure and diagnostic tracking

Copilot
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JerrettDavis
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Rewrite ObserverGenerator to support payload type extraction from attribute

Copilot
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Copilot
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Add payload type constructor to ObserverAttribute and fix thread safety issues

Copilot
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Copilot
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Complete rewrite of ObserverGenerator with payload type support

Copilot
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JerrettDavis
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Fix dynamic cast issue in ObserverGenerator, 10/12 tests passing

Copilot
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JerrettDavis
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Add comprehensive Observer pattern documentation and examples

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Copilot
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Fix parameter naming convention in NotificationSystem example

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Copilot
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Fix Observer generator: remove reflection, add nested/generic validation, fire-and-forget async, disable struct support

Copilot
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JerrettDavis
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Update docs/examples/tests: fix diagnostics, cancellation demo, add mixed handler test, verify struct diagnostics

Copilot
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JerrettDavis
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Fix review feedback: update struct support docs, remove AttributeTargets.Struct, improve async error handling, remove unused using

Copilot
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JerrettDavis
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Remove unused GenerateUnsubscribeMethod - disposal handled directly by Subscription.Dispose

Copilot
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JerrettDavis
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