fix: improve remove command query and pipe flows

[Loongphy]

This PR improves the remove command workflow and related cleanup behavior.

Summary:

• add codex-auth remove <query> with case-insensitive alias/email fragment matching
• require confirmation when one query matches multiple accounts
• fall back to the numbered selector when stdin is not a TTY
• print Removed N account(s): ... after successful deletion
• delete the removed account snapshot and any parseable accounts/auth.json.bak.* backups whose record_key matches the removed account
• if the removed account was active, switch to the first remaining account in registry order
• if no accounts remain after remove, delete ~/.codex/auth.json
• leave malformed auth.json.bak.* backups in place for manual cleanup or codex-auth clean

Validation:

• env ZIG_GLOBAL_CACHE_DIR=.zig-cache/test-global ZIG_LOCAL_CACHE_DIR=.zig-cache/test-local zig test src/main.zig -lc
• zig build run -- list

Plan and review log:

• tracked in plans/2026-03-20-remove-command.md

Current status:

• implementation committed and pushed
• latest follow-up commit: 7c7b247
• PR checks are running again after the active-auth cleanup change

Note

Improve remove command to support query-driven, --all, and non-TTY pipe flows

• Adds optional <query> and --all arguments to the remove command in cli.zig, replacing the previously interactive-only flow.
• In TTY mode, a query matching multiple accounts prompts for confirmation; in non-TTY (pipe) mode, multi-match queries return an error instead of hanging on stdin.
• Non-TTY sessions fall back to a numbered selector for interactive removal; numbered input is now strictly validated to reject non-numeric characters.
• After removal, the active account is reconciled: the best remaining account is promoted, or auth.json is deleted if none remain. Auth backup files for removed accounts are also cleaned up.
• Behavioral Change: handled CLI errors (no match, invalid selection, non-TTY confirmation unavailable) now exit with code 1 instead of surfacing internal error details.

^{Macroscope summarized 2fdfd98.}

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commit: 2fdfd98

[Loongphy]

/review PR