[ScriptedAlchemy]

Why

Refs #4428. Parent link is #4542 on simplify/automation-task-lease.
Fixed tasks and jobs interpreted the same schedule string and interval during validation and each due decision. Resolve that pair at admission so decisions cannot reconstruct conflicting timing states.

What changed

• Add immutable admitted configurations and jobs with concrete manual, interval, or cron schedules. Fixed-task configuration pins share the admitted value through Arc.
• Migrate daemon, dashboard, retained-run and user-job scheduling to direct schedule matches. Delete public ConfiguredInterval, the old parser/validator APIs, repeated decision parsing and invalid-to-manual fallbacks.
• Preserve patch omission/null and explicit-schedule precedence. Refuse invalid persisted schedules at runtime admission without rewriting stored data.

Scope

• External settings and job JSON remain unchanged. No generated wire contract changes or data migration.
• Job file reloads still re-admit definitions. This does not claim a cross-tick job cache or close all simplify(automation): resolve schedules once and remove the schedule-string/interval shadow configuration #4428 acceptance items.
• Run-ledger persistence, stale-lock settings, typed fact application and token accounting remain separate work. The dashboard run-history timeout reported on simplify(diagnostics): publish compiler status through the project owner #4545 is not fixed here.

Blast Radius

Scheduled fixed tasks, host receipts, user jobs and scheduler status use the admitted timing representation. Retry, activity, denial, cancellation and retained settlement behavior stay covered. Three retry fixtures now use a valid one-second cooldown and wait for that boundary instead of bypassing settings with zero.

Verification

• Bazel unit suites pass with automation 39, automation-runtime 434, configuration 38 and dashboard-api 203 tests. Dashboard-api retains one existing ignored manual measurement.
• Bazel automation runner passes 177 tests. The non-vacuous daemon scheduler-configuration filter passes 17 tests, including revisioned reads, discovery and re-enable.
• Focused Bazel clippy passes all six targets including daemon unit tests. Rustfmt, diff checks and commitlint pass. No limits or timeouts increased.

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