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+# Multi-Reroute (Rail) — Design
+
+Date: 2026-06-21
+Status: Approved (brainstorming complete, ready for implementation plan)
+
+## 1. Purpose
+
+A single node holding **N parallel pass-through lanes** (a "rail"), so you can run tidy
+bundles of wires across the graph instead of dropping many separate Reroute nodes. Each lane
+forwards any type; you grow/shrink the rail with +/− at either end.
+
+Seventh node in the `ComfyUI-Datasete-Gates` suite.
+
+## 2. Approach
+
+A **real pass-through node** with **any-type lanes** (`AnyType("*")`). Lane `i`'s input is
+forwarded to lane `i`'s output. An unconnected lane outputs an `ExecutionBlocker` so nothing
+downstream of an unused lane runs. (Not the frontend-only virtual-reroute trick — simpler and
+robust across all types; the trade-off is slots read as `*` instead of adapting to the wired
+type.)
+
+## 3. IO
+
+- Up to `MAX_LANES` (32) lanes, each: optional input `in_<i>` (`*`) → output `out_<i>` (`*`).
+- The node always returns a length-`MAX_LANES` tuple; the frontend shows only the active
+  lanes (default 4). Wired output indices are stable, so unshown trailing outputs are simply
+  unconnected.
+
+```
+RETURN_TYPES = (ANY,) * MAX_LANES        RETURN_NAMES = ("out_1", …, "out_32")
+INPUT_TYPES  = {"optional": {"in_1": (ANY,), …}}
+```
+
+No `IS_CHANGED` override — a reroute should be transparent/cacheable (re-runs only when an
+input value actually changes).
+
+## 4. Run logic
+
+```python
+def run(self, **kwargs):
+    blocker = ExecutionBlocker(None)
+    return tuple(
+        kwargs.get(f"in_{i+1}") if kwargs.get(f"in_{i+1}") is not None else blocker
+        for i in range(MAX_LANES)
+    )
+```
+
+Lane-count-agnostic: connected lanes forward their value; empty lanes block. The visible lane
+count is purely a frontend concern.
+
+## 5. Frontend (`web/multi_reroute.js`)
+
+- Render `lanes` lane rows (input + output pair), default 4; persist the count in a hidden
+  widget so reload restores the rail (the "use raw widgets_values to add slots before link
+  rewiring" pattern already used in this repo).
+- **+/− buttons**:
+  - **Bottom add/remove** (Phase 1): reveal/hide the next/last lane pair — trivial and
+    wiring-safe (only the end moves).
+  - **Top add/remove** (Phase 2): insert/remove a lane at the top while **preserving the
+    other lanes' wiring** — requires capturing links and re-mapping slot indices
+    (rgthree-style). Kept separate so a bug here can't scramble existing rails.
+- Lanes use the shared `AnyType` so any wire connects.
+- (Phase 3 polish) compact reroute-pill look / optional per-lane labels.
+
+## 6. Edge cases
+
+- Empty lane → `ExecutionBlocker` (downstream skipped). A legitimate `None` value is treated
+  as empty (reroute values are objects/tensors, effectively never `None`).
+- Removing a lane is from the **end** in Phase 1 (indices stay stable → links intact).
+  Mid/top removal is Phase 2 with remap.
+- More than `MAX_LANES` requested → capped (logged in UI).
+- Mixed types across lanes is fine — each lane is independent `*`.
+
+## 7. Code shape
+
+- `gates/anytype.py` *(new)* — shared `AnyType("*")` + `ANY` (textgate can dedupe onto this
+  later; not touched now).
+- `gates/reroute_node.py` *(new)* — pure `build_outputs(values, max_lanes, blocker)` +
+  `MultiReroute` node (lazy `ExecutionBlocker` import for testability).
+- `web/multi_reroute.js` *(new)* — dynamic lane slots + +/− buttons + persistence.
+- root `__init__.py` — additive merge of the node mapping.
+
+## 8. Testing
+
+- pytest: `anytype` equals-everything; `build_outputs` forwards connected lanes and blocks
+  empty ones (length == MAX_LANES); node `RETURN_TYPES` length + all-`*`.
+- Manual (live): add/remove lanes (bottom, then top), wire mixed types through, confirm values
+  pass and reload restores the rail; empty lanes don't trigger downstream.
diff --git a/docs/plans/2026-06-21-multi-reroute-implementation.md b/docs/plans/2026-06-21-multi-reroute-implementation.md
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+# Multi-Reroute (Rail) Implementation Plan
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** A `MultiReroute` node — N parallel any-type pass-through lanes ("rail") with +/− to add/remove lanes — so wire bundles stay tidy without many separate Reroute nodes.
+
+**Architecture:** A real pass-through node with `AnyType("*")` lanes: `in_i → out_i`, empty lane → `ExecutionBlocker`. Pure `build_outputs` is unit-tested; `ExecutionBlocker` is imported lazily. The frontend manages dynamic lane slots and persists the lane count. Bottom add/remove is Phase 1 (wiring-safe); top add/remove (link-preserving) is Phase 2.
+
+**Tech Stack:** Python 3.12 (stdlib), pytest 9; vanilla JS frontend.
+
+---
+
+## Conventions (read once)
+
+- **Test python:** `/media/p5/miniforge3/bin/python` (`PY=...`).
+- **Run tests:** `cd /media/p5/ComfyUI-Datasete-Gates && $PY -m pytest tests/test_anytype.py tests/test_reroute.py -v`
+- `gates/anytype.py` and `gates/reroute_node.py` import-safe without comfy (lazy
+  `ExecutionBlocker` inside `run`).
+- `__init__.py` edit is **additive** — re-Read first, extend the mappings.
+- `MAX_LANES = 32`, default visible lanes = 4.
+- Commit style: Conventional Commits + repo Co-Authored-By; stage only this node's paths.
+
+---
+
+### Task 1: `anytype.py` — shared wildcard
+
+**Files:** Create `gates/anytype.py`; Test `tests/test_anytype.py`
+
+**Step 1: Failing test**
+
+```python
+# tests/test_anytype.py
+from gates import anytype
+
+def test_any_equals_everything():
+    assert (anytype.ANY != "IMAGE") is False
+    assert (anytype.ANY != "LATENT") is False
+    assert isinstance(anytype.ANY, str)
+```
+
+**Step 2: Run → FAIL.**
+
+**Step 3: Implement**
+
+```python
+# gates/anytype.py
+"""Shared ComfyUI wildcard type."""
+
+
+class AnyType(str):
+    def __ne__(self, other):
+        return False
+
+
+ANY = AnyType("*")
+```
+
+**Step 4: Run → PASS.**  **Step 5: Commit** `feat: shared AnyType wildcard`
+
+---
+
+### Task 2: `reroute_node.py` — `build_outputs`
+
+**Files:** Create `gates/reroute_node.py`; Test `tests/test_reroute.py`
+
+**Step 1: Failing test**
+
+```python
+# tests/test_reroute.py
+from gates import reroute_node as rr
+
+def test_build_outputs_forwards_and_blocks():
+    B = object()  # blocker sentinel
+    vals = {"in_1": "A", "in_3": "C"}
+    out = rr.build_outputs(vals, max_lanes=4, blocker=B)
+    assert out == ("A", B, "C", B)
+
+def test_build_outputs_length():
+    B = object()
+    assert len(rr.build_outputs({}, max_lanes=rr.MAX_LANES, blocker=B)) == rr.MAX_LANES
+```
+
+**Step 2: Run → FAIL.**
+
+**Step 3: Implement**
+
+```python
+# gates/reroute_node.py
+from .anytype import ANY
+
+NODE_CLASS_MAPPINGS = {}
+NODE_DISPLAY_NAME_MAPPINGS = {}
+
+MAX_LANES = 32
+
+
+def build_outputs(values, max_lanes, blocker):
+    out = []
+    for i in range(max_lanes):
+        v = values.get(f"in_{i + 1}")
+        out.append(v if v is not None else blocker)
+    return tuple(out)
+```
+
+**Step 4: Run → PASS.**  **Step 5: Commit** `feat: multi-reroute build_outputs`
+
+---
+
+### Task 3: `reroute_node.py` — `MultiReroute` node
+
+**Files:** Modify `gates/reroute_node.py`, `tests/test_reroute.py`
+
+**Step 1: Failing test**
+
+```python
+def test_io_shape():
+    assert len(rr.MultiReroute.RETURN_TYPES) == rr.MAX_LANES
+    assert all(t == "*" for t in rr.MultiReroute.RETURN_TYPES)
+    assert rr.MultiReroute.RETURN_NAMES[0] == "out_1"
+    it = rr.MultiReroute.INPUT_TYPES()
+    assert "in_1" in it["optional"] and f"in_{rr.MAX_LANES}" in it["optional"]
+```
+
+**Step 2: Run → FAIL.**
+
+**Step 3: Implement (append)**
+
+```python
+class MultiReroute:
+    CATEGORY = "Datasete Gates"
+    FUNCTION = "run"
+    RETURN_TYPES = (ANY,) * MAX_LANES
+    RETURN_NAMES = tuple(f"out_{i + 1}" for i in range(MAX_LANES))
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {"optional": {f"in_{i + 1}": (ANY,) for i in range(MAX_LANES)}}
+
+    def run(self, **kwargs):
+        from comfy_execution.graph_utils import ExecutionBlocker
+        return build_outputs(kwargs, MAX_LANES, ExecutionBlocker(None))
+
+
+NODE_CLASS_MAPPINGS = {"MultiReroute": MultiReroute}
+NODE_DISPLAY_NAME_MAPPINGS = {"MultiReroute": "Multi Reroute (Rail)"}
+```
+
+> `RETURN_TYPES` entries are the `AnyType` instance (`== "*"`), so the test's `t == "*"`
+> holds. No `IS_CHANGED` (transparent/cacheable passthrough).
+
+**Step 4: Run → PASS.**  **Step 5: Commit** `feat: MultiReroute node (any-type pass-through lanes)`
+
+---
+
+### Task 4: Register in `__init__.py` (MERGE)
+
+**Files:** Modify `__init__.py`
+
+**Step 1:** Re-Read `__init__.py`; add inside `if __package__:`:
+
+```python
+    from .gates.reroute_node import NODE_CLASS_MAPPINGS as _RR_NODES, \
+        NODE_DISPLAY_NAME_MAPPINGS as _RR_NAMES
+```
+and merge into the final dicts:
+```python
+    NODE_CLASS_MAPPINGS = {**NODE_CLASS_MAPPINGS, **_RR_NODES}
+    NODE_DISPLAY_NAME_MAPPINGS = {**NODE_DISPLAY_NAME_MAPPINGS, **_RR_NAMES}
+```
+
+**Step 2:** `$PY -c "import gates.reroute_node; print(gates.reroute_node.NODE_CLASS_MAPPINGS)"`.
+
+**Step 3:** Full suite green: `$PY -m pytest tests/ -v`.
+
+**Step 4: Commit** `feat: register MultiReroute`
+
+---
+
+### Task 5: `web/multi_reroute.js` — dynamic lanes + bottom +/− (Phase 1)
+
+**Files:** Create `web/multi_reroute.js`
+
+`app.registerExtension` for `MultiReroute`:
+- On `nodeCreated`: ensure the node shows `lanes` lane pairs (default 4). Keep a hidden
+  `lanes` widget (count) so the rail count **persists** across save/reload — restore by
+  re-adding that many slot pairs (mirror the repo's existing dynamic-slot restore that reads
+  raw `widgets_values` before link rewiring).
+- Maintain exactly `lanes` visible input slots `in_1..in_lanes` and output slots
+  `out_1..out_lanes` (add/remove the trailing pair as the count changes).
+- **Bottom +**: `lanes++` → add `in_{n}`/`out_{n}`. **Bottom −**: `lanes--` → remove the last
+  pair (only the end moves, so existing wiring is untouched). Clamp `1..MAX_LANES`.
+- Buttons via on-node widgets (or the node context menu) labeled `+ lane` / `− lane`.
+- Slots are any-type (`*`) so any wire connects.
+
+**Manual verify:** add/remove lanes from the bottom; wire IMAGE through lane 1 and LATENT
+through lane 2; values pass; save+reload restores the lane count and wiring.
+
+**Commit** `feat: multi-reroute frontend — dynamic lanes + bottom add/remove`
+
+---
+
+### Task 6: `web/multi_reroute.js` — top +/− with wiring preservation (Phase 2)
+
+**Files:** Modify `web/multi_reroute.js`
+
+- **Top +**: insert a new lane at the top. Because slots are positional and links bind to
+  slot index, capture all current input/output links, add a pair, and **re-map links** so the
+  existing lanes keep their connections and the new empty lane is visually first.
+- **Top −**: remove the top lane, remap the rest up.
+- Implement against a small lane-model (list of logical lanes ↔ slot indices); rebuild slots
+  and reconnect from the model so a failure can't silently drop wires.
+
+**Manual verify:** with lanes 1–3 wired, Top + adds an empty lane at top and 1–3 stay wired;
+Top − removes it cleanly. Save/reload still consistent.
+
+**Commit** `feat: multi-reroute top add/remove (wiring-preserving)`
+
+---
+
+### Task 7: Live smoke test in ComfyUI
+
+Restart ComfyUI. Verify:
+- [ ] "Multi Reroute (Rail)" appears under "Datasete Gates" with 4 lanes.
+- [ ] Bottom +/− add/remove lanes; Top +/− (Phase 2) keep existing wiring.
+- [ ] Route mixed types (IMAGE, MASK, LATENT, STRING) through separate lanes → all pass intact.
+- [ ] An unconnected lane doesn't trigger its downstream (ExecutionBlocker).
+- [ ] Save + reload restores lane count and all connections.
+
+**Commit** (if fixes) `fix: multi-reroute live-test adjustments`
+
+---
+
+## Definition of done
+
+- `$PY -m pytest tests/test_anytype.py tests/test_reroute.py -v` green; full `tests/` green.
+- Manual checklist passes: lanes add/remove (bottom; top in P2), mixed-type pass-through,
+  empty-lane blocking, persistence.