fix(nats): prefer account tenancy

[yordis]

• Strict multi-tenant NATS guidance needs to reflect Accounts as the native isolation boundary.
• Subject-prefix tenancy should be reserved for shared-account fallbacks or explicit platform surfaces.
• Generic examples should avoid teaching weaker tenant isolation as the default.

[cursor]

PR Summary

Low Risk
Documentation-only updates that change recommended NATS multi-tenancy patterns; low implementation risk but could influence architectural decisions if misunderstood.

Overview
Updates the nats-design-subject skill and references to treat NATS Accounts as the default multi-tenant isolation boundary, keeping tenant subjects short and using exports/imports for cross-tenant federation.

Reframes subject-prefix tenancy as an explicit fallback (shared accounts or platform/aggregation surfaces), adds a new anti-pattern warning against relying on {tenant}.> for strict isolation, and revises JetStream/security/use-case examples to be account-scoped (streams/KV per account, platform monitoring/analytics via imported subjects).

^{Reviewed by Cursor Bugbot for commit 7cd01df. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 6669d654-224c-4e30-a2f8-a9c108b4b269

📥 Commits

Reviewing files that changed from the base of the PR and between 1d3d39f and 7cd01df.

📒 Files selected for processing (6)

• plugins/trogonstack-nats/skills/nats-design-subject/SKILL.md
• plugins/trogonstack-nats/skills/nats-design-subject/references/anti-patterns.md
• plugins/trogonstack-nats/skills/nats-design-subject/references/jetstream.md
• plugins/trogonstack-nats/skills/nats-design-subject/references/patterns.md
• plugins/trogonstack-nats/skills/nats-design-subject/references/security.md
• plugins/trogonstack-nats/skills/nats-design-subject/references/use-cases.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-nats-account-tenancy

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