chore: Add copilot instructions

[aymericmariaux]

No description provided.

[Copilot]

Pull request overview

Adds and corrects Copilot onboarding guidance for the Kotlin Multiplatform library.

Changes:

• Adds build, validation, architecture, and review instructions.
• Corrects namespace, package distribution, and JVM test commands.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
AGENTS.md	Corrects project and testing documentation.
.github/copilot-instructions.md	Adds Copilot coding-agent onboarding guidance.

Suppressed comments (2)

.github/copilot-instructions.md:42

• appleTest is not a device-test source set: it feeds the iOS simulator and macOS test targets, which require a macOS host but not a physical device (also reflected by AGENTS.md:140-142). Labeling it as “device” can cause agents to skip runnable Apple tests or describe their validation requirements incorrectly.

                                       # commonTest/androidHostTest (no device), androidDeviceTest/appleTest (device)

.github/copilot-instructions.md:29

• This contradicts line 21: build does not fail on Linux merely because Apple targets are present; Kotlin/Native skips those unsupported targets, so the command can succeed with incomplete Apple validation. Only the XCFramework task requires macOS here. Reword this so agents do not incorrectly report that build itself cannot be attempted on Linux.

macOS-only — do NOT attempt on Linux, they will fail; say so in the PR description instead of pretending they were verified:

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