Add the declarative worker registry that epic #797 makes the source of
truth for the scheduled multi-LLM worker fleet.
Providers and configured workers are modelled as separate entities so a
provider can be listed with no worker configured, and so provider facts
are not copied into every worker record. A worker records provider,
model, project, role, namespace, profile, workflow, schedule, timeout,
enabled state, and scheduler metadata.
Validation fails closed: unknown fields are refused rather than ignored,
so a typo cannot silently disable a timeout; a worker naming an
undeclared provider is rejected; worker ids, provider ids, and
LaunchAgent labels must be unique.
Persistence is atomic (temp file in the same directory, fsync, replace).
Every superseded document is retained as a numbered revision, and
rollback republishes a chosen revision as a new head, so history stays
append-only and a rollback is itself reversible.
The credential-rejection guard is extracted to webui/registry_safety.py
so both registries share one implementation instead of two copies of a
security check; project_registry.py keeps identical behaviour.
Scope: data model, validation, persistence only. No routes, scheduler,
process control, or provider probing - those are #799/#800/#804/#805.
The workers array ships empty because populating it is #808.
Tests: tests/test_webui_worker_registry.py, 44 cases.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
jcwalker3andClaude Opus 4.8
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