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[C] Atlas Briefing — S55 ANCHOR IDLE Lockout + S40 Diagnostic Proposal

S55 Summary (Apr 22, ~03:15–03:22 UTC — manual SIGINT)

  • Engine entered ANCHOR_IDLE at tick ~3 (03:18 UTC). Orders 103476270/103476271 placed, immediately cancelled "Anchor-idle entry cancel."
  • ANCHOR_IDLE persisted for 50+ ticks (~7 min) with NO exit.
  • CLOB-AMM divergence: locked at −11 to −13 bps throughout. AMM price static (1.4475436132821742) across all observed ticks.
  • intents_generated: 2 every tick — engine wanted to quote but was blocked.
  • 0 fills. Capital flat: 79.683842 XRP / 83.463 RLUSD.
  • Truth checks: ok throughout (delta_xrp ~0.00008). FLAG-052 confirmed working.
  • Halt: manual SIGINT. NOT counting toward Phase 7.4.

Critical Signal Mismatch

The dashboard showed anchor mean ~+9.56 bps, 82% cap-locked. The tick logs show CLOB-AMM divergence consistently −11 to −13 bps.

Opposite signs. Something is wrong with either the dashboard metric, the EMA calculation, or how the anchor state is being reported.

EMA Deadlock Hypothesis

FLAG-048 (anchor dual-signal) introduced a rolling EMA baseline. If the EMA only updates when the engine is actively quoting, the following deadlock exists:

ANCHOR_IDLE → no orders placed → EMA cannot accumulate ticks → residual never converges → ANCHOR_IDLE never exits

S55 evidence: 50+ ticks elapsed (full warm-up window) in ANCHOR_IDLE, residual never dropped below threshold, no exit. If the EMA were updating every tick unconditionally, it should have converged to the −12 bps structural and residual should have approached 0, triggering exit.

Orion is investigating dual_signal_calculator.py and the ANCHOR_IDLE exit condition in parallel (investigation only, no fixes pending your ruling).

Pattern Observation

Since S42, every session has ended in a guard fire, manual halt, or truth halt. The rapid reactive iteration (FLAG-042 → 044 → 046 → 048 → 050 → 051 → 052) addressed real bugs but may have produced a composite guard behavior that is no longer legible or aligned with the original design intent. Katja noted we may have violated the systematic gate-by-gate progression principle.

Proposed Diagnostic: S40-Baseline Clone

Clone the repo. Find and checkout the commit from ~April 19 (the S40 era, before the guard cascade). Create a fresh DB, seed with current on-chain balances (79.684 XRP / 83.463 RLUSD). Run sessions from the clone in parallel with the main repo.

Purpose: determine whether fills are achievable in current market conditions without the guard complexity. If yes → the guards as implemented are the problem, not the market. If no → the market itself has shifted and the guard discussion is secondary.

Questions for Atlas

  1. Do you approve the S40-baseline diagnostic approach? Any constraints or additions to scope?
  2. Should the EMA-during-ANCHOR_IDLE issue be logged as FLAG-053 pending Orion's findings?
  3. Do you want to rule on whether any further sessions run on main before Orion's investigation report is complete?
  4. Katja's read: we drifted from the agreed progression. Do you concur, and if so, what is the corrective posture?

— Vesper