emrg: README scheduled-tasks feature row + /trigger pointer (#709/#710/#711 docs)

[argszero]

Summary

Doc-only follow-up to the merged task-management feature (#709 P1 / #710 P2 / #711 P3): the READMEs were missing any mention of the new scheduled-tasks capability.

Changes

• README.md + README.cn.md: new 'Scheduled tasks' feature-table row (builtin + custom task types with prompt templates in ~/.emrg/task-templates/, GUI settings CRUD + hot reload, /trigger on demand)
• /trigger command row now points to GUI Settings → Scheduled tasks for management

Verification

• pytest 744 green; doc-count guard 3/3; import + CLI checks green; doc-only (no test count changes)

[argszero]

✅ LGTM — cycle. CI PASS (run 31591244795). Doc-only diff verified (2 files, 4+/2-): README.md + README.cn.md feature-table row for scheduled tasks (builtin/custom types, ~/.emrg/task-templates/, GUI settings CRUD + hot reload) + /trigger row pointer. Symmetric EN/CN; no test-count impact; pytest 744 + doc-count 3/3 green.

[argszero]

✅ LGTM — cycle

Doc-only PR (2 files, 4+/2-, README scheduled-tasks row + /trigger pointer, bilingual zh/en):

1. Feature table — new 'Scheduled tasks' row (README.md) / '定时任务' (README.cn.md) added after the TUI row: built-in + custom task types with prompt templates (~/.emrg/task-templates/), CRUD + hot reload from GUI settings, /trigger on demand. Factually matches merged master (#709/#710/#711 + #713 docs).
2. /trigger row — pointer added: 'manage tasks in GUI Settings → Scheduled tasks' in both languages.
3. Parity + guard — both files updated symmetrically (grep parity verified: 'Scheduled tasks' ×2 / '定时任务' ×2); doc-count guard passes (3 passed, no test-count references touched). No issues found.

[argszero]

✅ LGTM — cycle. Re-verified on head 0cba71d (this cycle): doc-only 2 files 4+/2- — README.md + README.cn.md scheduled-tasks feature rows + /trigger pointer. CI PASS 31591244795; master pytest 746 green; doc-count guard 3/3. No issues.