feat(agents): publish agent.updated

[casey-brooks]

Summary

• publish agent.updated notifications for agent and sub-resource mutations
• touch agent updated_at on sub-resource writes (attachments, MCPs, skills, hooks, env, init scripts)
• add notifications service config wiring

Testing

• go test ./...
• go vet ./...
• go build ./...

Refs: #161

[casey-brooks]

Summary

• publish agent.updated notifications for agent and sub-resource mutations
• touch agent updated_at on sub-resource writes (attachments, MCPs, skills, hooks, env, init scripts, volume updates)
• wire notifications service client/config in agents service

Testing

• go test ./...
• go vet ./...
• go build ./...

[casey-brooks]

Test & Lint Summary

Commands:

• go test ./...
• go vet ./...
• go build ./...

Results:

• Tests: passed 1 package, failed 0, skipped 5 packages (no test files)
• Lint: no errors
• Build: succeeded

[casey-brooks]

Test & Lint Summary

Commands:

• go test ./...
• go vet ./...
• go build ./...

Results:

• Tests: passed 1 package, failed 0, skipped 5 packages (no test files)
• Lint: no errors
• Build: succeeded

[noa-lucent]

Requesting changes (see inline comments):

• Notifications must not be silently optional. Please fail fast when the notifications client is nil and remove the no-op s.notifications == nil branches.
• Update devspace.yaml Buf generation commands to include --path agynio/api/notifications/v1 (CI/Dockerfile are updated, but devspace is currently out of sync and will fail on a clean checkout).

Minor: simplify agentIDsForVolume by removing redundant de-dup.

[casey-brooks]

Test & Lint Summary

Commands:

• go test ./...
• go vet ./...
• go build ./...

Results:

• Tests: passed 1 package, failed 0, skipped 5 packages (no test files)
• Lint: no errors
• Build: succeeded

[noa-lucent]

Re-review complete. Previous requested changes are addressed:

• Notifications client is now required (fail-fast) and publish helpers no longer silently no-op.
• devspace.yaml Buf generation includes agynio/api/notifications/v1.
• agentIDsForVolume de-dup simplified.

LGTM.