Snapshot WIP: solver HP epic progress, BPHX/HX physics, BMAD skill refresh.

Capture uncommitted solver robustness work (regularization, domain errors, linear solver lifecycle, tube DP/MSH), web workbench updates, and synced BMAD skills across IDE agent folders before starting BPHX pressure-drop.

Co-authored-by: Cursor <cursoragent@cursor.com>

plans/frontend-hvac-followups-2026-07.md

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+# Frontend + HVAC follow-ups (2026-07-17)
+
+CLI-first: the web UI is a JSON workbench over `simulate_from_json`.
+
+## CLI coverage (post this session)
+
+| Item | Status |
+|------|--------|
+| CapillaryTube / CentrifugalCompressor | Wired in `create_component` (solver stubs still thin) |
+| Screw `volume_index` / `slide_valve_position` | CLI params |
+| Flooded `ua_mode=cooper` + pool geometry | CLI params |
+| FinCoil `wet_surface` | CLI param |
+| Fan `drive_chain` | CLI param |
+| ExpansionValve `flow_model` (orifice/exv/txv) | CLI params |
+| GasCooler / FanCoilUnit / ShellAndTubeHx | Rating helpers only — **not** full CLI `Component` yet |
+
+## Examples review
+
+Synced into `apps/web/public/examples/` from `crates/cli/examples/`:
+
+- flooded / watercooled / aircooled chillers
+- BPHX, heat-pump reversing valve, EXV orifice
+- Hx air–water 4-port
+
+Still thin / missing as UI-loadable demos:
+
+- Capillary + centrifugal standalone cycles
+- Cooper flooded UA demo
+- Screw Vi / slide valve using `ScrewEconomizerCompressor` (existing `chiller_r134a_slide_valve.json` uses IsentropicCompressor slide target — different feature)
+
+## Additional HVAC gaps (research)
+
+### P0
+1. Centrifugal map + IGV / surge limits (beyond φ–Mach stub)
+2. Flooded S&T geometric bundle (passes, Gorenflo) — beyond UA / Cooper outer loop
+3. Shared flooded vessel / multi-circuit
+4. Open flash-tank economizer
+5. Moving-boundary zone HTC from correlation registry
+
+### P1
+6. Receiver + suction accumulator (charge inventory)
+7. Desuperheater / heat-recovery condenser
+8. Hot-gas bypass / capacity unload valve
+9. Cooling tower / dry cooler / adiabatic condenser
+10. Scroll EVI
+11. Multi-circuit face-split air coils
+
+### P2
+12. CO₂ ejector
+13. Oil separator / OCR
+14. Falling-film evaporator
+15. Cascade intermediate HX
+
+## Frontend done this session
+
+- README port **3030** (was 3031)
+- Deprecate `ui/`
+- Palette: Centrifugal, Capillary, ReversingValve, FreeCooling + new params
+- Example picker + Multi-run parallel sweep panel