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feat(docs): KEP-2599: Decouple runtime lifecycle from TrainJobs to simplify updating runtimes (#3428)

* feat(docs): add KEP-2599 for mutable runtimes

Proposes allowing TrainingRuntimes and ClusterTrainingRuntimes to be
mutable by introducing TrainingRuntimeSnapshot resources. TrainJobs
snapshot their referenced runtime configuration on first reconciliation,
decoupling job execution from runtime changes.

Key changes:
- New TrainingRuntimeSnapshot CRD to store point-in-time runtime config
- Remove finalizers from runtimes (no longer needed)
- Remove TrainJobWatcher interface and boilerplate
- Automatic migration for existing TrainJobs on upgrade

Addresses issue #2599

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Rob Bell <robell@redhat.com>

* feat(docs): improve KEP-2599 clarity and completeness

Improvements to the mutable runtimes KEP:
- Clarify operational problems with finalizers (orphaned finalizers,
  namespace deletion issues)
- Better explain why runtime updates are risky (fetched on every
  reconciliation, no design-level guarantees)
- Add concrete examples of runtime proliferation (pytorch-2.0, pytorch-2.1)
- Add RBAC section showing required permissions
- Improve summary to clearly state API change (new CRD)
- Clarify test cases for migration scenarios

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Rob Bell <robell@redhat.com>

* docs: address Copilot review comments on KEP-2599

- Fix relative link to include README.md in Trainer v2 design reference
- Remove extra space in Goals heading
- Change 'Training Job' to 'TrainJobs' for consistency
- Fix 'lookup' to 'look up' (correct verb form)
- Add 'create' verb to RBAC permissions for TrainingRuntimeSnapshot

Signed-off-by: Rob Bell <robell@redhat.com>

* docs: clarify KEP-2599 divergence from original design

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Rob Bell <robell@redhat.com>

* docs: add source runtim... (continued)

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