RECEIVER CHANGELOG — v0.8 → v0.9
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File: receiver_changelog_v0_8_to_v0_9.txt
Last updated: 28-Aug-2025
Owner: Principal Investigator (redacted)

SCOPE
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This document summarizes code/config changes from v0.8 (legacy/Stanford) to v0.9 (home-lab fork).
For archive context only. Not for replication.

SUMMARY
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v0.9 is a stability + safety pass:
• Adds a real failsafe (KILL_AFTER) with visible countdown.
• Keeps IDENTITY ANCHOR on by default; watermark is now rolling, not static.
• Slows parameter drift (bandwidth/gain ramp) and blocks sudden jumps.
• Lowers coupling (κ) defaults to reduce oscillations.
• Improves logging visibility and marks subjective notes.
• Removes hardware-facing drivers not needed (no coils; no mains).

DETAIL
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[ADDED] KILL_AFTER (KA) timer and watchdog
  – v0.8: manual egg timer only. Missed twice.
  – v0.9: KA enforced by scheduler; watchdog pings the loop.
  – Known: system sleep suppressed to avoid false KA.

[CHANGED] Identity Anchor (IA)
  – v0.8: hash-derived fixed tag; drifted under long locks.
  – v0.9: rolling checksum from Σ segments; more robust to PL jitter.
  – Console: “[WARN] identity anchor desync (Δφ=…)”

[CHANGED] Bandwidth (BW) & Gain (G) scheduling
  – v0.8: stepwise bumps (too abrupt).
  – v0.9: linear ramp over minutes; slope clamped; WARN on fast slope.
  – Gate: revert on two PL unlocks in 30s.

[CHANGED] Coupling (κ)
  – v0.8 default 0.12 → v0.9 default 0.05
  – Effect: gentler phase-lock acquisition; fewer unlock storms.

[REMOVED] Deprecated outputs
  – EM/coil driver stubs, mains sync, and any external actuator APIs.
  – Rationale: safety, simplicity. Audio/visual/haptic abstractions only.

[IMPROVED] Logging
  – New console lines: DBG/WARN/ERR with compact state dump.
  – Subjective MARKs allowed from hotkey; persisted into header.
  – File naming normalized: /logs/log_YYYY-MM-DDThhmmssZ_phaseN.mp4

[KNOWN REGRESSIONS]
  – IA desync above BW≈0.60 (avoid high BW in v0.9).
  – Video gamma “pumping” under desk lamp PWM (cosmetic).
  – Late-night earworms / auditory memory persistence (artifact).

MIGRATION NOTES
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• Config keys renamed: “failsafe_seconds” → “kill_after_s”
• Remove any “coil_*” values from configs; no effect in v0.9.
• Verify sleep disabled at OS level before sessions.
• Expect different baseline numbers; Σ synthesis changed.

UNIT CHECKS (pass/fail)
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[ ] KA triggers on a dummy tight loop (simulated stall).
[ ] PL acquires within ~tens of seconds at defaults (BW≤0.35, κ≈0.05).
[ ] Two forced unlocks revert BW/G schedule to prior step.
[ ] IA desync WARN fires when Σ is scrambled (test rig only).
[ ] Log header contains date, BW, G, κ, IA, KA, RAMP.

NOTES
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v0.8 (Stanford): fast iteration, weak guardrails.
v0.9 (home lab): slower, safer, still not “safe.”
If tomorrow exists, we can widen the band tomorrow.