adk run does not support arrow keys or input history #8022

🔴 Required Information

Describe the Bug:
In adk run, the arrow keys don't work at the [user]: prompt. Pressing arrow up prints ^[[A instead of recalling the previous message, and left/right arrows can't move the cursor to edit a line.

Steps to Reproduce:

1. pip install google-adk
2. Create any agent folder and run adk run my_agent
3. Send a message, e.g. hello
4. At the next [user]: prompt, press arrow up

Expected Behavior:
Arrow up recalls hello, like in most terminal programs (and the Python REPL).

Observed Behavior:
^[[A is printed. If you press Enter, the raw escape sequence '\x1b[A' is sent to the agent as the message.

Environment Details:

• ADK Library Version (pip show google-adk): 2.14.0
• Desktop OS: macOS
• Python Version (python -V): 3.12

Model Information:

• Are you using LiteLLM: No
• Which model is being used: gemini-3.5-flash (not model-specific)

🟡 Optional Information

Additional Context:
run_interactively in src/google/adk/cli/cli.py reads input with the built-in input(). input() only provides line editing and history after the readline module has been imported, and the CLI never imports it. Importing readline (when available; it is not on Windows) fixes it. I'm happy to send a PR.

How often has this issue occurred?:

• Always (100%)