Remove -y flag from browsers delete, make non-interactive

[rgarcia]

Summary

• Remove the -y/--yes confirmation flag from kernel browsers delete
• Make browser deletion non-interactive by default

The confirmation prompt was overly cautious and not necessary:

1. LLM compatibility: The -y flag frequently trips up LLMs that use the CLI - they either forget to pass it or get stuck waiting for interactive confirmation that never comes in their execution environment.

2. Idempotent operation: Browser deletion is already idempotent (deleting a non-existent browser succeeds), so requiring confirmation adds friction without meaningful protection.

3. Consistency: Other delete commands in the CLI (like browser session cleanup) don't require confirmation.

Test plan

• Existing browser delete tests updated and passing
• go build ./... succeeds
• Manual verification: kernel browsers delete <id> now deletes without prompting

---

Note

Makes kernel browsers delete non-interactive and removes confirmation flags.

• Removes -y/--yes flag and all interactive confirmation logic from BrowsersCmd.Delete; command is now idempotent and non-interactive
• Delete now tries DeleteByID then persistent delete, treating not-found as success; prints a single success message
• Removes flag wiring and usage of --yes in CLI (runBrowsersDelete) and README examples
• Updates tests to match the new behavior and deletes confirm-path test cases

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[masnwilliams]

lgtm