feat(display): route long output through $PAGER - #203
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Add LinearCli.CLI.Pager module that pipes text output through the user's configured pager (default: less -FRX) when stdout is a terminal and the content exceeds the terminal height. Refactor Display.show/2 to collect all text first, then delegate to Pager.maybe_page/2. Paging is skipped for JSON output, non-TTY environments, PAGER="" or PAGER=cat, and content that fits on screen. Falls back to IO.puts when the pager exits with a non-zero status. Closes EXT-23 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
LinearCli.CLI.Pagermodule withmaybe_page/2that routes text through$PAGER(default:less -FRX) when stdout is a terminal and content exceeds terminal heightDisplay.show/2text path to collect all output into a single string, then delegate toPager.maybe_page/2instead of callingIO.putsper itemPAGER="",PAGER=cat, and content that fits on screenIO.putswhen pager exits with non-zero status (e.g. pager not found)Test plan
less -FRX, custom$PAGER, temp-file content, temp-file cleanup, cleanup on crash, non-zero exit fallbackmix credocleanmix format --check-formattedcleanCloses EXT-23
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