Document typed runtime diagnostics

[DerekCorniello]

Summary

• define the stable runtime diagnostic registry and ownership rules
• document typed runtime panic formatting and compatibility
• record the compiler/runtime synchronization and release ordering

This is the canonical cross-repository specification for the matching runtime, compiler, and website PRs.

[greptile-apps]

Greptile Summary

The PR establishes the cross-repository contract for typed runtime diagnostics and updates panic examples to use stable diagnostic codes.

• Defines the E06xx runtime diagnostic registry and its ownership and compatibility rules.
• Documents the panic[E####] output format and typed examples.
• Records warning-registry publication requirements and cross-repository release ordering.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
docs/design/diagnostics.md	Defines runtime diagnostic codes, warning publication requirements, ownership boundaries, and release synchronization.
docs/design/panics.md	Updates the documented panic format and examples to include typed E06xx diagnostic codes.

_{Reviews (2): Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." | Re-trigger Greptile}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud