optimize: prompts and stability of super agent and planner

[vcfgv]

📝 Pull Request Template

1. Related Issue

Closes # (issue number)

Type of Change (select one)

Code Refactor

3. Description

Planner: non-interference, pass-through; adequate=false only for schedule confirmation.
Planner: schedule only if agent skills support monitoring; scheduling is centralized (use schedule_config), never delegate to agents.
Planner: if no schedule → run once (no pause); inline “confirm” with schedule → proceed (no pause).
Planner: agent_name must be valid (target or from tool_get_enabled_agents); never invent names.
Planner examples updated: once-by-default, inline-confirm, safe-alternatives.
Super Agent: no “cannot”; confident handoff to Planner; factual answers only (no implied tool calls/data fetch).
Super Agent: don’t hijack Planner confirmations; forward schedules/confirmations via handoff_to_planner.
Super Agent examples added: direct answer, scheduled monitoring handoff, multi-step analysis handoff, schedule-confirmation handoff.

4. Testing

• I have tested this locally.
• I have updated or added relevant tests.

5. Checklist

• I have read the Code of Conduct
• I have followed the Contributing Guidelines
• My changes follow the project's coding style