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PWR-HYBRID-3/claude_memory/2026-04-16-session-wrap.md
Dane Sabo cebf8c167a Initial umbrella repo: thesis + FRET pipeline + plant model with first controllers 
Folds three previously-separate pieces into one preliminary-example repo
for the HAHACS thesis:

- thesis/ (submodule) → gitea Thesis.git — the PhD proposal
- fret-pipeline/ — FRET requirements to AIGER controller (was
  ~/Documents/fret_processing/; prior single-commit history abandoned
  per user decision)
- plant-model/ — 10-state PKE + lumped T/H PWR model (was
  ~/Documents/PKE_Playground/; never version-controlled before)
- presentations/2026DICE/ (submodule) → gitea 2026DICE.git
- reachability/, hardware/ — empty placeholders for Thrust 3 and HIL
- docs/architecture.md — how the discrete and continuous layers compose
- claude_memory/ — session notes and scratch knowledge pattern

Plant model refactored to thesis naming (x, plant, u, ref); pke_th_rhs
now takes u as an explicit arg instead of reading rho_ext from the
params struct. First two controllers built to the contract
u = ctrl_<mode>(t, x, plant, ref): ctrl_null (baseline) and
ctrl_operation (stabilizing, proportional on T_avg). Validated under a
100% -> 80% Q_sg step: ctrl_operation reduces steady-state T_avg drift
~47% vs. the unforced plant.

Root CLAUDE.md emphasizes that CLAUDE.md files are living documents and
that any knowledge not captured before a session ends is lost forever;
claude_memory/ holds the session-level notes that haven't stabilized
enough to graduate into a CLAUDE.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-16 16:24:11 -04:00

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2026-04-16 — session wrap, switching to nvim

Short capstone note. The substantive work is captured in two earlier notes from today:

  • 2026-04-16-repo-restructure.md — umbrella repo created, submodules wired, CLAUDE.md / README / architecture docs written, claude_memory/ pattern established.
  • 2026-04-16-controllers-roughout.md — plant refactored to thesis naming, controller contract locked, ctrl_null and ctrl_operation built, validated live in MATLAB (ctrl_operation cuts T_avg drift by ~47% under a 100%→80% Q_sg step).

Both notes have the full paths-touched lists.

Last-minute adds

  • MATLAB terminal invocation (from plant-model/CLAUDE.md): matlab -nodesktop -nosplash -r "main" — runs from the terminal, figures open in their own windows, drops at >> prompt. Use -batch "main" for headless CI-style checks (no figures shown), or matlab -r "main" & to launch the full IDE backgrounded.
  • MATLAB version: R2025b installed at /Applications/MATLAB_R2025b.app/bin/matlab. Octave not installed.
  • One-time gotcha fixed at wrap: my earlier Write of the thesis-aligned plant-model/CLAUDE.md silently didn't persist (tool reported success but the file held the pre-refactor content on re-Read). Rewrote it at wrap time. If this recurs, verify with Read after any Write on an existing file, not just trust the tool's success message.

Repo state at wrap

  • Initial commit made: see git log --oneline in ~/Documents/pwr-hybrid-3-demo/.
  • Submodules at: thesis/ @ gitea main tip, presentations/2026DICE/ @ gitea main tip (note: original ~/Documents/Writing/2026DICE/ still has uncommitted local edits that were NOT pulled into the submodule — user was warned earlier and deferred).
  • Old folders ~/Documents/fret_processing/ and ~/Documents/PKE_Playground/ still exist untouched. Delete whenever user is confident the umbrella is right.
  • No remote yet for the umbrella repo. Will need to create gitea.danesabo.com/danesabo/pwr-hybrid-3-demo and git remote add origin
    • push when user is ready.

What's on deck (for the next session, whichever agent)

Per the controllers rough-out note: knock out ctrl_shutdown (one line), ctrl_scram (a few lines + uncertainty later), then ctrl_heatup (the interesting transitory one — ramp + temperature tracking). Invariants and X_safe regions come after, explicitly deferred by the user. Do not try to verify the whole hybrid system at once — pick one mode, discharge its reach-set obligation, move on.