chore(gitignore): collapse codex-pair entries to single .codex-pair/ line (ADR-092)

[Lykhoyda]

Summary

ask-llm plugin v0.7.1 moved every codex-pair state artifact (marker, log, cache, ignore globs, pause sentinel, inflight locks) under a single .codex-pair/ directory per ADR-092. The old four-line gitignore block no longer matches the layout — those exact paths never get created by the new hook, so the entries are dead.

Old (dead)	New (replaces all four)
.codex-pair-context.md	.codex-pair/
.codex-pair-log.jsonl	(covers context.md, log.jsonl, cache/, state/, ignore, inflight)
.codex-pair-cache/
.codex-pair-state/

Why this matters

Plugin v0.7.1's hook self-gates on .codex-pair/context.md. The old marker at .codex-pair-context.md is no longer recognized — so contributors who set up codex-pair under v0.6.x see the hook go silent after the plugin update (the log goes ~6 days without entries — that's how I noticed). New contributors enabling codex-pair only need the single .codex-pair/ gitignore entry; the entire opt-in state directory is per-developer and never committed.

Verified locally

• Migrated .codex-pair-context.md → .codex-pair/context.md (marker preserved verbatim)
• Migrated .codex-pair-log.jsonl → .codex-pair/log.jsonl
• Migrated .codex-pair-cache/ → .codex-pair/cache/
• Migrated .codex-pair-state/ → .codex-pair/state/
• New hook fires on the next Edit — smoke test caught both planted issues (regex-injection HIGH + non-import type MED) in 19s
• git check-ignore -v confirms all three new paths are covered by the single .codex-pair/ line

Test plan

• gitignore patterns verified via git check-ignore
• codex-pair hook fires correctly with new layout (smoke test)
• CI green (gitignore-only change; should be quick)

Refs

• ADR-092 — single-directory layout for codex-pair state
• ask-llm plugin v0.7.1

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