fix(inquirerer): implement stack-based ownership for keypress handling

[pyramation]

Summary

This PR fixes the keypress duplication issue when multiple Inquirerer instances share the same stdin by implementing a stack-based ownership model. Previously, the SharedInputState would broadcast keypresses to ALL active instances, causing duplicate behavior. Now, only the current owner (top of stack) receives events.

Key changes:

• Single-owner dispatch: dataHandler now only dispatches to activeStack[top] instead of iterating over all active instances
• Stack-based ownership: resume() pushes to top (with move-to-top semantics), pause() removes from stack
• Handler preservation: pause() no longer calls clearHandlers(), fixing the issue where handlers were lost between questions
• Per-instance Ctrl+C: Ctrl+C now routes through the current owner's process wrapper via new exitProcess() method

Also removes the [create-gen-app] LICENSE updated... log message.

Review & Testing Checklist for Human

• Critical: Manual test with multiple instances - Create 2+ Inquirerer instances sharing stdin, run list/checkbox prompts sequentially, verify arrow keys move selection once (not twice). This is the core fix and cannot be verified by unit tests alone.
• Verify handler persistence - Confirm that removing clearHandlers() from pause() doesn't cause handler leaks. Check that handlers are still cleared appropriately at end of each question.
• Test raw mode cleanup - Verify stdin isn't left in raw mode after all instances are destroyed/paused
• Test Ctrl+C behavior - Verify Ctrl+C still exits properly with the new owner-based routing

Recommended test plan:

const prompter1 = new Inquirerer({ input: process.stdin, output: process.stdout });
const prompter2 = new Inquirerer({ input: process.stdin, output: process.stdout });

// Use prompter1 for a list question, verify single arrow key response
await prompter1.prompt({}, [{ name: 'test', type: 'list', options: ['a', 'b', 'c'] }]);
prompter1.close();

// Use prompter2, verify it still works correctly
await prompter2.prompt({}, [{ name: 'test2', type: 'list', options: ['x', 'y', 'z'] }]);
prompter2.close();

Notes

• All 90 inquirerer tests pass, all 28 create-gen-app tests pass
• The isActive() method now derives state from stack position rather than a boolean flag

Link to Devin run: https://app.devin.ai/sessions/48555739db3d4f1b9e9edfa9ea1e559a
Requested by: Dan Lynch (@pyramation)

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