+added console spport for lyngio

+added console support to lyng/jlyng CLI
+added unicode escapes
+created tetris console sample

docs/lyng.io.console.md

@@ -0,0 +1,101 @@
+### lyng.io.console
+
+`lyng.io.console` provides optional rich console support for terminal applications.
+
+> **Note:** this module is part of `lyngio`. It must be explicitly installed into the import manager by host code.
+>
+> **CLI note:** the `lyng` CLI now installs `lyng.io.console` in its base scope by default, so scripts can simply `import lyng.io.console`.
+
+#### Install in host
+
+```kotlin
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.io.console.createConsoleModule
+import net.sergeych.lyngio.console.security.PermitAllConsoleAccessPolicy
+
+suspend fun initScope() {
+    val scope = Script.newScope()
+    createConsoleModule(PermitAllConsoleAccessPolicy, scope)
+}
+```
+
+#### Use in Lyng script
+
+```lyng
+import lyng.io.console
+
+println("supported = " + Console.isSupported())
+println("tty = " + Console.isTty())
+println("ansi = " + Console.ansiLevel())
+println("geometry = " + Console.geometry())
+
+Console.write("hello\n")
+Console.home()
+Console.clear()
+Console.moveTo(1, 1)
+Console.clearLine()
+Console.enterAltScreen()
+Console.leaveAltScreen()
+Console.setCursorVisible(true)
+Console.flush()
+```
+
+Interactive sample script in this repo:
+
+```bash
+lyng examples/tetris_console.lyng
+```
+
+#### API
+
+- `Console.isSupported(): Bool` — whether console control is available on this platform/runtime.
+- `Console.isTty(): Bool` — whether output is attached to a TTY.
+- `Console.ansiLevel(): String` — `NONE`, `BASIC16`, `ANSI256`, `TRUECOLOR`.
+- `Console.geometry(): ConsoleGeometry?` — `{columns, rows}` as typed object or `null`.
+- `Console.details(): ConsoleDetails` — consolidated capability object.
+- `Console.write(text: String)` — writes to console output.
+- `Console.flush()` — flushes buffered output.
+- `Console.home()` — moves cursor to top-left.
+- `Console.clear()` — clears visible screen.
+- `Console.moveTo(row: Int, column: Int)` — moves cursor to 1-based row/column.
+- `Console.clearLine()` — clears current line.
+- `Console.enterAltScreen()` — switch to alternate screen buffer.
+- `Console.leaveAltScreen()` — return to normal screen buffer.
+- `Console.setCursorVisible(visible: Bool)` — shows/hides cursor.
+- `Console.events(): ConsoleEventStream` — endless iterable source of typed events: `ConsoleResizeEvent`, `ConsoleKeyEvent`.
+- `Console.setRawMode(enabled: Bool): Bool` — requests raw input mode, returns `true` if changed.
+
+#### Event Iteration
+
+Use events from a loop, typically in a separate coroutine:
+
+```lyng
+launch {
+    for (ev in Console.events()) {
+        if (ev is ConsoleKeyEvent) {
+            // handle key
+        }
+    }
+}
+```
+
+#### Event format
+
+`Console.events()` emits `ConsoleEvent` with at least:
+
+- `type: String` — `resize`, `keydown`, `keyup`
+
+Additional fields:
+
+- `ConsoleResizeEvent`: `columns`, `rows`
+- `ConsoleKeyEvent`: `key`, `code`, `ctrl`, `alt`, `shift`, `meta`
+
+#### Security policy
+
+The module uses `ConsoleAccessPolicy` with operations:
+
+- `WriteText(length)`
+- `ReadEvents`
+- `SetRawMode(enabled)`
+
+For permissive mode, use `PermitAllConsoleAccessPolicy`.