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>

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Cargo dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Verify pinned toolchain
+        run: cargo --version
+
+      - name: Check formatting
+        run: cargo fmt --check
+
+      - name: Run Clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
+
+      - name: Jacobian health gate (Epic 0)
+        run: cargo test -p entropyk-components --test jacobian_health_sweep
+
+      - name: Add no_std check target
+        run: rustup target add thumbv7em-none-eabihf
+
+      - name: Check solver-core no_std build (Story 1.2)
+        run: cargo check -p entropyk-solver-core --no-default-features --target thumbv7em-none-eabihf
+
+      - name: Run workspace tests
+        run: cargo test --workspace