Closes the loop on three bug classes from Plan 03 triage:
context-load regressions (missing @Autowired), UI/backend drift
on template variables, and hand-maintained TS enum unions caused
by springdoc polymorphic schema quirk.
Covers 5 tasks: context-startup smoke test, template-variables
SSOT endpoint, second Playwright spec, String-to-enum migrations
on 5 condition fields, and @DiscriminatorMapping on AlertCondition.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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