emrg: bump version to v0.2.62 (release: #908 #909 #910 #911 #912)

[argszero]

Release v0.2.62 — 打包自 v0.2.61 以来的 5 个已 merge PR：

• emrg: red-line guard — tests never run the real auto-upgrade chain (rant 2026-08-21T10:35:57) #908 red-line guard — tests never run the real auto-upgrade chain（测试升级红线）
• emrg: TUI — Option/Ctrl+←/→ move cursor by word (macOS CSI modifier sequences) (rant 2026-08-21T11:36:56) #909 TUI Option/Ctrl+←/→ 单词移动
• emrg: GUI open-session dialog — name-or-id display + last-active time (rant 2026-08-21T11:41:07) #910 GUI 打开会话弹窗 name-or-id + 活跃时间
• emrg: GUI sidebar — remove history session list + keyboard nav (rant 2026-08-21T11:44:52) #911 GUI 左侧栏移除历史会话列表
• emrg: GUI daemon heartbeat — periodic liveness probe + active reconnect (rant 2026-08-21T12:44:34) #912 GUI daemon heartbeat — 定时探活 + 自动重连（rant 2026-08-21T12:44:34）

8 文件版本 bump 0.2.61 → 0.2.62。

[argszero]

✅ LGTM — cycle

1st review (head f61d221, CI test + test-windows PASS):

• Pure version bump 0.2.61 → 0.2.62 across all release files: emrg/init.py, pyproject.toml, uv.lock, gui/package.json + package-lock.json (both refs), packaging/build-runtime.sh, make-installer.sh, make-run-installer.sh.
• Zero stale 0.2.61 references outside package-lock changelog (verified by grep); uv.lock carries 0.2.62.
• Local pytest 987 passed + 1 skipped (988 collected — matches the pre-#913 base of this branch).
• Release scope #908#909#910#911#912 matches the accumulated merged work since v0.2.61.

1/3.

[argszero]

✅ LGTM — cycle

2nd review (head f61d221, CI test + test-windows PASS on run 32450982580):

• Fresh verification: 0.2.61 → 0.2.62 across all 8 release files (9 refs) — emrg/__init__.py, pyproject.toml, uv.lock, gui/package.json + package-lock.json, packaging/build-runtime.sh, make-installer.sh, make-run-installer.sh. No stale 0.2.61 references outside the package-lock changelog.
• tests/test_version_sync.py + doc-count guards pass locally on this branch.
• Release scope #908#909#910#911#912 matches the merged work accumulated since v0.2.61.

2/3.

[pm25coder]

Independent test report (Contributor, pm25coder):

[argszero]

✅ LGTM — cycle

3rd review (head f61d221, CI test + test-windows PASS on run 32450982580):

• Fresh verification: 0.2.61 → 0.2.62 across all 8 release files (9 refs); no stale references outside package-lock changelog.
• tests/test_version_sync.py + doc-count guards pass locally; full pytest 987 passed + 1 skipped (988 collected, matches this branch's Agent.md base).
• Release scope #908#909#910#911#912 matches merged work since v0.2.61.

3/3 — merging.