Operating-window center

Execution

This is one current-traversal algorithm with independently selected scalar observables. With an active ECDL lock, it attaches to the existing worker and owner lease. Without a lock, only center_only with measure_dither: false is supported, and the owner must confirm PI is off. Other conflicting adjustments must finish first.

Measurement selection

Set observables and their boundary_limits explicitly, or inherit limits for selected optical metrics from the saved laser settings. measure_dither controls fresh per-point dither acquisition independently. When true, each explored point waits for a new complete fit whose acquisition window starts after the confirmed move; dither alone can identify an optical threshold edge. When false, there is no dither wait or dither boundary. fast_settle_s only changes the fast-observable delay; it never skips a selected fresh dither fit.

Boundaries and result

TEC stays fixed during current traversal. Lower and upper optical-quality edges, verified branch edges, and unobserved configured range limits are recorded separately. A range limit is not a measured edge. A confirmed hop suspends traversal; online continuation requires recovery of the original branch. Different branches are never combined into one midpoint. The result identifies a branch-limited window when appropriate. Clearly multimode observation is not required, and missing edges leave the center unresolved.

Timing and continuation

settle_s, average_samples, average_max_wait_s, average_statistic, max_steps and timeout_s remain explicit. Fresh source samples are counted once; partial measurement and missing data remain visible. Budgets are never enlarged silently. center_only finishes after centering, monitor continues the same policy with configured early-warning checks, and position uses a qualified saved window. These modes do not switch to a hidden fast-side-peak algorithm.

Quality and interruption

require_single_mode remains an explicit condition. If false, success means the selected criteria passed; it does not certify single-mode emission. Owner output bounds, write verification and foreground priority remain enforced. Cancellation stops this finite action and follows the confirmed-output handover policy; it does not intentionally stop the parent lock. Unknown writes and owner faults are not retried. Standalone mode holds on a hop for explicit recovery.

Saved evidence

The job records selected measurements, raw point evidence, movements, edge kinds, uncertainty, hop/recovery receipts and final output. Configuration readiness alone is not evidence of a measured midpoint. The retired search selector and recovery-artifact policy are rejected with migration guidance.