fix(gjc): restore Bun launcher session detection

[chiznoir]

What changed

• restore the published @gajae-code/coding-agent marker used by Bun/Node GJC launchers
• cover both idle-pane and transcript-backed process detection

Evidence

• current launcher resolves to @gajae-code/coding-agent/bin/gjc.js
• commit 4a88a12 changed the detector to the nonexistent @chatmux-code/coding-agent marker during the ChatMux rebrand
• changed-line privacy scan found no usernames, machine paths, credentials, tokens, or secrets

Verification

• TSX_TSCONFIG_PATH=server/tsconfig.json npx tsx --test server/modules/providers/tests/live-sessions.service.test.ts (63 passed)
• typecheck, Rust fmt/clippy/tests, lint, identity check, and production build passed
• full local npm test currently reports 7 unrelated frontend loader/import failures; PR CI is authoritative for clean Node 22/24 runners

[Copilot]

Pull request overview

Restores correct GJC launcher/session detection by switching the packaged-entry marker back to the published @gajae-code/coding-agent scope, ensuring Bun/Node-launched gjc processes are recognized reliably.

Changes:

• Update isGjcCommandLine detection to match the published package marker (@gajae-code/coding-agent).
• Update isGjcProcessArgs detection for bun/node argv[1] to match the same published marker.
• Adjust live session tests to assert against the restored @gajae-code/coding-agent/bin/gjc.js path.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
server/modules/providers/services/live-sessions.service.ts	Restores the packaged-entry marker used to detect interpreter-launched gjc processes.
server/modules/providers/tests/live-sessions.service.test.ts	Updates assertions to cover the restored marker for both argv-anchored and cmdline-based detection.

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[devswha]

리브랜드 커밋 4a88a12 가 실재하지 않는 패키지명으로 일괄 치환하면서 깨진 detection 을 되돌리는 변경이 맞습니다.

검증:

• npm 레지스트리 확인 — @gajae-code/coding-agent 200, @chatmux-code/coding-agent 404 (published 된 적 없음). 따라서 구 마커 하위호환을 남길 이유도 없습니다.
• main 에 남아있던 @chatmux-code 참조 3곳(서비스 2 + tmux e2e 하네스 1)을 전부 덮었습니다. dist-server/ 잔재는 git 미추적이라 무관.
• 로컬 live-sessions.service.test.ts 63/63 통과.
• 새 assertion 은 수정 전 코드에서 basename 이 gjc.js 라 반드시 실패하므로 비어있는 테스트가 아닙니다.

LGTM.