feat(dashboard): surface durable execution attempts

[mpangrazzi]

Stack

• Base PR: feat(durable): add durable execution engine for v2 #264 — durable execution engine for v2
• This PR should be reviewed and merged after feat(durable): add durable execution engine for v2 #264.

What changed

• Emit one hayhooks.durable.attempt trace per durable worker attempt from the Hayhooks integration boundary.
• Correlate attempts with deployment, execution ID, attempt number, execution kind, and definition revision.
• Classify durable traces in the dashboard with existing visual tokens and promote execution/checkpoint tags into the summary.
• Treat Haystack breakpoints and durable suspension as successful checkpoints instead of dashboard failures.
• Add the dashboard product brief used to keep this extension aligned with the existing interface.

Scope

This is durable execution observability only. It does not add durable A2A execution, A2A trace correlation, or an A2A dashboard kind. The dashboard remains an observability surface, not an execution control plane.

Reviewer guide

1. Start with deploy_utils.py: tracing wraps the selected durable runner while preserving its sync/async execution mode.
2. Review tracing.py: checkpoint exceptions are successful, tagged outcomes; ordinary exceptions still fail.
3. Review the dashboard kind/tag additions and the focused component/classification tests.
4. Confirm the portable hayhooks.durable package still has no dependency on Hayhooks server tracing.

Verification

• Inherits the full engine qualification recorded in feat(durable): add durable execution engine for v2 #264
• npm test -- --run: 108 passed
• npm run lint
• npm run build

[ArzelaAscoIi]

Looks good!

[ArzelaAscoIi]

thanks!