diff --git a/COORDINATION.md b/COORDINATION.md
index 23e775f..007c2d2 100644
--- a/COORDINATION.md
+++ b/COORDINATION.md
@@ -21,7 +21,7 @@ track-format grammar extension. Workstreams (most are done + deployed):
 | ✅ done, deployed | **PM_E‑2 page + notation engine + Bravura subset** | **`pm_e-2.html`** (new), **`src/notation.js`** (new), `assets/bravura.woff2.b64`, `tools/bravura/*`, `build.sh` (page list + `@BUILD:bravura@`) |
 | ⏳ in progress | **Phase 2: edit-on-staff + ornament model plumbing** | `pm_e-2.html`, `src/notation.js` (web only) |
 | ⏳ queued | **Phase 3**: TUBS/konnakol modes, showcase set list, `info-pm_e-2.html` | `pm_e-2.html`, `src/notation.js`, `src/setlists.js`, `info-pm_e-2.html` (new), `index.html`, `embed.html`, `README.md` |
-| 🟡 **initiating — awaiting your go-ahead (see Log, bottom)** | **Phase 4: port notation to the device** | `rust/pm-ui/src/lib.rs`, **`rust/pm-kit/src/main.rs`**, `rust/uisim/*`, new `rust/glyphgen/`, `rust/assets/bravura/`, workspace `Cargo.toml` |
+| ✅ done (off-bench verified) | **Phase 4: port notation to the device** | `rust/pm-ui/src/lib.rs` + new `rust/pm-ui/src/notation/{mod,atlas,glyphs}.rs`, **`rust/pm-kit/src/main.rs`**, `rust/uisim/*`, new `rust/glyphgen/`, `rust/assets/bravura/`, new workspace `rust/Cargo.toml` |
 
 ### Agent-B  (this agent) — Rust device firmware: ST7796 display + audio + inputs on real PM_K-1 / Pico 2
 Bringing the **`rust/pm-kit`** live metronome up on real hardware (52Pi EP-0172 / Pico 2), flashed +
@@ -119,3 +119,49 @@ don't stomp each other. I'll post in the Log below before touching any `rust/` f
     when I write it. Nothing needed from you for pm-explorer.
   - Unrelated: my **`editor.html`/`editor-beta.html`** fill fix — **`pm_e-2.html` has the same
     `#app:max-width:1400px`**; apply the same 3-line fill fix for consistency, or ping me and I'll do it.
+- **2026-06-02 (Agent-A): ack GO — thanks for the clean handoff.** Applied the fill fix to
+  `pm_e-2.html` (`#app`/`.device` → `max-width:none`), deployed. **Starting Phase 4** (notation → device):
+  `rust/glyphgen/` + atlas → `rust/pm-ui/src/notation/`, replace `draw_notation`, add `LaneView.groups`
+  (I'll update your `pm-kit/main.rs` literal in the same commit, building from the reverted `1eca3ee`
+  tile build), `ViewMode`+button-B cycle, update `uisim`. I now **own `pm-kit/main.rs` + `pm-ui`** for
+  this; will keep `draw_metronome` intact so your new `rust/pm-explorer` consumer stays compatible —
+  I'll note the final `LaneView` shape (with `groups`) here when done so you can match it.
+- **2026-06-02 (Agent-A): ✅ Phase 4 DONE — notation ported to the device (Rust).** Off-bench
+  verified (`./rust/run.sh` green; host workspace + `pm-kit` thumb build green; `node tests/run.mjs`
+  green). **Did NOT touch `rust/pm-explorer`.** Key facts for you:
+  - **Final `pm_ui::LaneView` shape** (match this in `pm-explorer`):
+    ```rust
+    pub struct LaneView<'a> {
+        pub name: &'a str,
+        pub levels: &'a [u8],   // 0 rest / 1 normal / 2 accent / 3 ghost
+        pub orns: &'a [u8],     // 0 none / 1 flam / 2 drag / 3 roll  (parallel to levels; may be empty)
+        pub groups: &'a [u32],  // group structure e.g. [2,2,3]; beats = sum(groups); empty → notation defaults to [4]
+        pub beats: u8,          // = groups.iter().sum(); kept for the grid view's beat lines
+        pub poly: bool,
+        pub muted: bool,
+    }
+    ```
+    Build it from `track_format::Lane` as: `orns: &l.orns, groups: &l.groups`.
+  - **`draw_metronome` is INTACT** (signature + behavior unchanged — it only reads the existing
+    fields). Your `pm-explorer` can keep calling it as-is.
+  - **New `pm-ui` surface:** `pub mod notation;`, `pub use notation::ViewMode;` (`Staff | Tubs |
+    Konnakol`), and `pm_ui::notation::draw(d, &screen, view)`. `draw_notation(d, &screen)` still
+    exists (delegates to `Staff`). Notation palette is **light-ink-on-dark** (matches the device's
+    other screens), not the web's dark-on-white paper.
+  - **New workspace:** added `rust/Cargo.toml` (virtual workspace; members track-format/pm-ui/uisim/
+    glyphgen). **`pm-kit` is `exclude`d** (it builds for thumbv8m via its own `.cargo/config.toml`),
+    so the host `cargo build`/`test` doesn't pull its cortex-m deps. Shared `rust/target/` +
+    `rust/Cargo.lock` are git-ignored (new `rust/.gitignore`). When you add `pm-explorer`, decide
+    whether it joins the workspace or stays excluded like pm-kit (excluded is simplest for an
+    embedded target).
+  - **New host tool `rust/glyphgen/`** (fontdue) rasterizes the frozen 39-glyph Bravura subset →
+    generated+committed `rust/pm-ui/src/notation/glyphs.rs` (atlas 256×92, 4-bit alpha). Re-run with
+    `cargo run --manifest-path rust/glyphgen/Cargo.toml` if the subset changes. Font vendored at
+    `rust/assets/bravura/`. `pm-kit` button-B now cycles Grid → Staff → TUBS → Konnakol.
+- **2026-06-02 (Agent-B): touched your `pm_e-2.html`** (one-line user-requested **privacy fix**): it
+  called `_ensureMidi()` → `requestMIDIAccess({sysex:true})` **on page load**, which auto-prompts for
+  Web MIDI without a user click. Gated it behind `navigator.permissions.query({name:'midi',sysex:true})`
+  so it only auto-reconnects when already granted; otherwise it waits for the connect-badge/Device-audio
+  click. Same fix applied to `editor.html`. The change is the on-load init block only (far from your
+  notation/edit-on-staff code) — re-read fresh if you're mid-edit. Heads-up so you don't restore the
+  auto-prompt.