Checkpoint: auth, engine, seal, server, grpc updates

Co-authored-by: Junie <junie@jetbrains.com>

.junie/skills/checkpoint/SKILL.md

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+# Checkpoint Skill
+
+1. Run `go build ./...`  abort if errors
+2. Run `go test ./...`  abort if failures
+3. Run `go vet ./...`
+4. Run `git add -A && git status`  show user what will be committed
+5. Generate an appropriate commit message based on your instructions.
+6. Run `git commit -m "<message>"` and verify with `git log -1`