---
id: 2026-15
title: Weekly — 2026-04-08
type: Weekly
created: 2026-04-08T11:00:00Z
modified: 2026-04-08T11:00:00Z
tags: [weekly]
---

# Weekly - 2026 CW 15 (Wed 2026-04-08)

## Accomplishments

### 🎯 MAJOR: FRET Specifications & Reactive Synthesis Progress (April 3)
**Significant formal verification work — specifications written, realizability conflicts identified and resolved, test traces analyzed.**

- Wrote FRET specifications for the reactor automaton
- Worked through heatup mode requirements: bounded temperature rate (dT_dt constraints), maximum heatup duration before SCRAM
- Developed watchdog pattern for bounded time constraints — key insight: "within T seconds satisfy SCRAM" would force SCRAM always (no happy path to load following); watchdog only fires if STILL in heatup when timer expires
- Typed input/output variables: Inputs (STARTUP, t_dot_exceeded, t_max_exceeded, t_power_min), Outputs (SCRAM, OP_MODE, Cold_Shutdown, Heatup, Load_Follow)
- Hit and resolved realizability conflict (PWR-0000 vs PWR-2001 vs PWR-3002) — added "While !SCRAM" scope to PWR-2001 so startup only happens outside SCRAM
- Analyzed 67 test traces against 8 requirements:
  - Only 4/67 pass all requirements
  - PWR-2001 fails in 49 traces (adversarial: STARTUP + t_max_exceeded simultaneously)
  - 75 physical consistency warnings (Heatup=1 with OP_MODE=0)
  - Traces appear to be counterexamples, not valid behaviors
- Identified need for explicit both-sides specification of inequalities/implications — potential FRETless design improvement (implicit iff support)

**Status:** DR-72 (FRET specs) marked Done. Understanding of FRET's limitations deepening — feeding into FRETless design ideas.

### DICE 2026 Travel Booked (April 4)
- Expedia booking: $999.77 (hotel + car for SLC)
- DR-78 marked Done
- Conference: May 12-13, Salt Lake City

### Firefly III — March 2026 Fully Reconciled (April 3)
- Imported 18 Apple Card transactions (March 28 - April 2)
- Cross-referenced 136 statement transactions against 148 in Firefly
- Cleaned up migration garbage: phantom $5,755.53 payment, duplicate entries, wrong-sign Daily Cash adjustments
- Added 3 missing Daily Cash Adjustment clawbacks
- **March Apple Card statement now reconciled clean** ($2,898.11 → $9,976.38 payment → $8,728.99 charges → $1,650.72 ending)

### 🔧 Anthropic Billing Change — Infrastructure Pivot (April 4)
**Major cost optimization after Anthropic announced third-party tool billing changes.**

- Anthropic subscriptions no longer cover OpenClaw usage (every token billed separately)
- Old config exposure: estimated $600-900/month at Opus 4.6 default
- Reconfigured same day:
  - Default model: Sonnet 4.5 (was Opus 4.6) — ~5-10x cheaper
  - Heartbeats: Haiku 4.5, 60-minute intervals (was 30min on Opus)
  - Prompt caching enabled: "long" retention (90% savings on repeated context)
  - Opus available on demand via override
- Target: ~$100/month total
- Created PER project in Plane for personal tasks (non-thesis/car/website)

### iMessage Echo Loop Bug — Diagnosed & Fixed (April 6)
- Outbound iMessage replies were echoing back as inbound messages, creating infinite loops
- Root cause: DM chat classified as "self-chat" + binary corruption in `imsg watch` text causing echo cache misses
- Applied surgical patch to OpenClaw monitor — forced drop of all `is_from_me` messages in self-chat context
- ⚠️ Patch gets overwritten on OpenClaw updates — needs re-application

### Thesis Draft
- Preliminary Results section skeleton complete with equations (from late March)
- PKE, thermal-hydraulic, and reactivity feedback equations in place with LaTeX labels
- Awaiting Dan's V1 feedback to unlock next steps

## Pushed or Rescheduled

**Dan Cole V1 Feedback:**
- Proposal draft sent March 17 — now Day 22+ with no response
- Expected — Dan busy with Luis finishing up
- All downstream formal verification work blocked on his review

**FRET Discussion:**
- Punted from Easter Sunday (April 6) to this week
- Topic: extracting actual automaton/AIGER circuit from FRET reactive synthesis output
- Dane wants visualization of the automaton itself for easier trace analysis

**Email Infrastructure:**
- himalaya still broken on all accounts (since March 24)
- Only default (zoho) accessible

## To Do

**This Week (CW15):**
- Discuss FRET automaton extraction with Dan at group meeting
- Present FRETless as publication roadmap (FRET gaps → enum/FSM extensions → continuous dynamics → nuclear case study)
- Continue barrier certificate work (DR-74, DR-75 — load following + cold shutdown)
- Continue reachability analysis (DR-73, DR-76 — heatup + SCRAM modes)
- DICE presentation prep (May 12-13 approaching — ~5 weeks out)
- Martha's Run 5K — April 11 (Friday)

**Personal:**
- PER-3: Find +1 for May 9 wedding (deadline passed ~April 6 — status?)
- PER-1: Evaluate OpenAI Codex Plus as potential cost optimization
- PER-4/5: Cancel YouTube TV / Subscribe Pittsburgh Sportsnet

**Upcoming:**
- May 9: Wedding (guest, not in party)
- May 10: DICE departure to SLC
- May 12-13: DICE 2026 conference

## Context

**Weather:**
- April 1: 58-63°F, rainy morning
- April 3: 85°F high, rain chance midday
- April 4: 87°F high, sunny
- April 6: Heavy rain, 54°F

**Fitness Battery (April 6):**
- Broad jump: 65 inches
- Dead hang: 32 seconds
- Bench press: 135 × 5
- Lat pulldown est. 1RM: 172
- Leg extension est. 1RM: 187
- Dane felt good about it — saw Jackie and Andreas at gym

**Notes:**
- FRET specification work is building real expertise — realizability conflicts, trace analysis, variable typing are all thesis-level skills
- The watchdog pattern insight is worth writing up — common control pattern that FRET handles awkwardly
- FRETless iff-style specification is a concrete design improvement to pitch
- Cost optimization was handled well — same-day response, minimal disruption
- CW14 cycle was productive: 9 items created, most FRET/analysis work progressed significantly