Add quit_if_one_screen for dynamic paging with explicit end-of-output signalling

[Copilot]

• Understand the existing drop-based AliveGuard / CheckQuitIfOneScreen mechanism
• Add Pager::end_of_output() method (gated on dynamic_output) that sends Command::CheckQuitIfOneScreen directly
• Update set_quit_if_one_screen docs to describe both the explicit (end_of_output) and implicit (drop) signalling mechanisms
• Add emit_events::set_quit_if_one_screen and emit_events::end_of_output unit tests
• Fix clippy::format_collect lint in check_quit_if_one_screen_noop_when_overflow test (replace map(|i| format!(...)).collect::<String>() with fold + writeln!)
• All tests pass, zero clippy warnings with --features=dynamic_output,search --tests --examples -- -D warnings

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[keith-hall]

@copilot I see some lint issues in CI, unrelated to our changes but might make the maintainers not be able to merge... Let's try fixing them.
You can see the failures by running

cargo clippy --features=dynamic_output,search --tests --examples -- -D warnings

[Copilot]

@copilot I see some lint issues in CI, unrelated to our changes but might make the maintainers not be able to merge... Let's try fixing them.
You can see the failures by running
...

Fixed in 0f69549. The clippy::format_collect lint in check_quit_if_one_screen_noop_when_overflow was firing because (0..20).map(|i| format!("line {i}\n")).collect::<String>() builds a string via format-in-map; replaced with fold + writeln! as clippy suggests. cargo clippy --features=dynamic_output,search --tests --examples -- -D warnings now passes cleanly.