Add tsci update doc

docs/command-line/tsci-update.md

@@ -0,0 +1,46 @@
+---
+title: tsci update
+description: Update tscircuit component packages to their latest version
+---
+
+`tsci update` updates tscircuit packages in your project. When given a package specifier, it updates only that package. When run without arguments, it updates all dependencies in `package.json` that start with `@tsci/` or `@tscircuit/`.
+
+## Usage
+
+```bash
+tsci update [packageSpec]
+```
+
+### Arguments
+- `packageSpec` *(optional)* – a package to update (e.g. `@tscircuit/math-utils`). When omitted, updates all `@tsci/*` and `@tscircuit/*` dependencies found in `dependencies` and `devDependencies`.
+
+## Examples
+
+Update a specific package:
+
+```bash
+$ tsci update @tscircuit/seveibar/PICO_W
+Updating @tsci/seveibar.PICO_W...
+> bun update @tsci/seveibar.PICO_W
+bun update v1.3.11 (af24e281)
+
+installed @tsci/seveibar.PICO_W@0.1.0
+
+1 package installed [1095.00ms]
+✓ Updated @tsci/seveibar.PICO_W successfully
+```
+
+Update all tscircuit packages:
+
+```bash
+$ tsci update
+Updating 2 packages: @tsci/seveibar.HS91L02W2C01 @tsci/seveibar.PICO_W...
+> bun update @tsci/seveibar.HS91L02W2C01 @tsci/seveibar.PICO_W
+bun update v1.3.11 (af24e281)
+
+installed @tsci/seveibar.HS91L02W2C01@0.0.1
+installed @tsci/seveibar.PICO_W@0.1.0
+
+2 packages installed [567.00ms]
+✓ Updated all tscircuit packages successfully
+```