[chaliy]

What changed

• In a terminal session, read with no pipe or redirect now waits for a line typed on the terminal, instead of getting EOF. -p prints the prompt, -s turns echo off, -n N returns after N characters, and -t SECS gives up with status 142. Ctrl-D on an empty line is EOF (status 1), and Ctrl-C interrupts the command. Piped or redirected stdin still wins.
• select shows its menu and PS3 and reads the choice from the terminal.
• Prompt detection: Terminal::input_prompt() returns the question on the cursor line while a command waits for a typed line. This covers read -p, echo -n 'Q? '; read and select. TerminalTool reports activity: "input" with input_prompt, so an agent can tell a question apart from a busy command. Python input_prompt() and JS inputPrompt() mirror it.
• Fixes found along the way: a reader dropped mid-wait (a read -t deadline, Ctrl-C) no longer leaves the session marked idle, and run_until_idle polls an idle session once more so an expired read -t fires.

Why

Interactive scripts (read -p "Continue? [y/N]", select menus) silently got EOF before. This change narrows L-TERM-002 to cat, head and other commands that still get EOF.

Before / After

$ read -p 'Name? ' n; echo "hi $n"
Before: prints "hi " immediately (EOF, rc=1)
After:  shows "Name? ", waits; typing "Ann Lee<Enter>" prints "hi Ann Lee"
TerminalTool: {"activity": "input", "input_prompt": "Overwrite? [y/N] ", ...}

Tests: terminal::tests::{read_waits_for_a_typed_line, read_flags_on_terminal, select_reads_choice_from_terminal} and terminal::tool::tests::question_is_reported_as_input. The L-TERM-002 evidence test now uses cat. Locally, all 2868 lib tests (--features terminal,git) and 1329 integration tests pass, and clippy is clean with and without terminal.

Risk

• Low. The terminal path is behind the terminal feature, which is off by default. Without a terminal, read and select behave exactly as before.

Checklist

• Tests added or updated
• Backward compatibility considered

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