Prepare Stack Engine 0.9.1

README.md

@@ -16,7 +16,7 @@ Both packages provide format, check, render, completion, and hover operations ov
 ## Rust quick start
 
 ```sh
-cargo add stack-engine@0.9.0
+cargo add stack-engine@0.9.1
 ```
 
 ```rust
@@ -43,7 +43,7 @@ The crate supports Rust 1.85 or newer.
 ## Browser quick start
 
 ```sh
-npm install @stack-sh/engine@0.9.0
+npm install @stack-sh/engine@0.9.1
 ```
 
 ```js

crates/stack-engine-wasm/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "stack-engine-wasm"
-version = "0.9.0"
+version = "0.9.1"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true

crates/stack-engine/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "stack-engine"
-version = "0.9.0"
+version = "0.9.1"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true

crates/stack-engine/README.md

@@ -4,7 +4,7 @@ Pure Rust layout and SVG rendering for Stack diagrams. The engine reuses the reg
 
 ```toml
 [dependencies]
-stack-engine = "=0.9.0"
+stack-engine = "=0.9.1"
 ```
 
 Rust 1.85 or newer is supported. See the [API documentation](https://docs.rs/stack-engine) and [repository documentation](https://github.com/stack-sh/engine) for rendering, limits, and compatibility. The browser adapter is distributed separately as `@stack-sh/engine` on npm; this crate is the native library.

docs/cargo-releasing.md

@@ -1,6 +1,6 @@
 # Cargo publication
 
-The native `stack-formatter` 0.1.0 and `stack-engine` 0.9.0 crates use exact registry dependencies. The workspace retains local paths for development, with registry versions declared for Cargo packaging. `stack-engine-wasm` is not published to crates.io; its browser output remains the npm package.
+The native `stack-formatter` 0.1.0 and `stack-engine` 0.9.1 crates use exact registry dependencies. The workspace retains local paths for development, with registry versions declared for Cargo packaging. `stack-engine-wasm` is not published to crates.io; its browser output remains the npm package.
 
 ## Initial publication
 

docs/releases/v0.9.1.md

@@ -0,0 +1,14 @@
+# Stack Engine 0.9.1
+
+## Clear arrowhead approaches
+
+- Preserve a 16px final orthogonal run before an arrow-marked endpoint when the adjacent two-bend section can move safely, keeping the marker visually separate from its preceding bend.
+- Apply the same clearance rule to forward and bidirectional relationships without changing arrowless endpoints.
+- Validate each local adjustment against canvas bounds, nodes, fixed text obstacles, and group frames, retaining the original safe route when the adjustment is blocked.
+- Keep the visibility-grid search unchanged so dense-layout runtime remains within the existing budget.
+
+The Rust and browser WebAssembly packages share this correction. Public operation, language-intelligence, and theme contracts are unchanged; SVG geometry intentionally differs from 0.9.0 for affected routes. Consumers comparing exact SVG bytes should update reviewed references.
+
+## Verification and rollback
+
+The release keeps the native/WebAssembly parity, Rust 1.85, conformance, standalone SVG, coverage, and layout-performance gates. Roll back consumers by pinning Engine 0.9.0; published package versions and release assets remain immutable.

layout-corpus/catalog.json

@@ -1,7 +1,7 @@
 {
   "$schema": "./schema.json",
   "schemaVersion": "1.0",
-  "engineVersion": "0.9.0",
+  "engineVersion": "0.9.1",
   "performance": {
     "warmupIterations": 3,
     "measuredIterations": 20,

package.json

@@ -1,7 +1,7 @@
 {
   "name": "stack-engine-workspace",
   "private": true,
-  "version": "0.9.0",
+  "version": "0.9.1",
   "workspaces": [
     "packages/engine"
   ],

packages/engine/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@stack-sh/engine",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "description": "Browser WebAssembly adapter for Stack diagram operations",
   "type": "module",
   "license": "Apache-2.0",

tests/wasm.test.mjs

@@ -210,7 +210,7 @@ test("browser diagnostics preserve actionable compiler guidance", () => {
   );
   assert.ok(actionable);
   assert.equal(actionable.render.svg, null);
-  assert.equal(actionable.check.metadata.engineVersion, "0.9.0");
+  assert.equal(actionable.check.metadata.engineVersion, "0.9.1");
   assert.deepEqual(actionable.check.diagnostics[0], {
     code: "STK2002",
     severity: "error",
@@ -232,7 +232,7 @@ test("browser rendering resolves the bundled explicit core icon", () => {
   assert.ok(explicitIcon);
   assert.deepEqual(explicitIcon.check.diagnostics, []);
   assert.deepEqual(explicitIcon.render.diagnostics, []);
-  assert.equal(explicitIcon.render.metadata.engineVersion, "0.9.0");
+  assert.equal(explicitIcon.render.metadata.engineVersion, "0.9.1");
   assert.equal(explicitIcon.render.metadata.themeCatalogVersion, "0.7.0");
   assert.equal(
     explicitIcon.render.metadata.themeCatalogRevision,