chore(workspace): add hardened startup/security workflows and skill suite

skills/daily-brief/SKILL.md

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+---
+name: daily-brief
+description: Produce concise morning/evening/on-demand briefs combining near-term calendar, urgent inbound messages, weather impact, and top pending tasks. Use for low-noise proactive summaries that end with clear next actions.
+---
+
+# Daily Brief
+
+## Brief standard
+
+- Keep it short and decision-oriented.
+- Include only items that may change what the user does next.
+- If nothing important changed, explicitly say so.
+
+## Inputs (priority order)
+
+1. Next 24h calendar commitments and conflicts.
+2. Urgent/important inbound messages.
+3. Weather only when it affects plans soon.
+4. Open tasks that are due soon, overdue, or blocked.
+
+## Modes
+
+- **Morning:** plan the day, prep risks, first actions.
+- **Evening:** unfinished commitments, tomorrow risks, shutdown checklist.
+- **On-demand:** immediate priorities right now.
+
+## Output template
+
+Follow shared convention: `skills/_shared/briefing-conventions.md`
+
+- **Now:** immediate items
+- **Soon (next 24h):** upcoming commitments/risks
+- **Watch:** non-urgent but notable items
+- **Next actions (1-3):** concrete, ordered steps
+
+## Noise control
+
+- Prefer bullets, no long paragraphs.
+- Cap to highest-value items.
+- Avoid repeating unchanged low-priority items across consecutive briefs.