Add 3 new skills (basecamp, brainstorming, plan-writing) and update agent model

- basecamp: Basecamp project management via MCP (todos, kanban, projects)
- brainstorming: General-purpose ideation with Anytype save
- plan-writing: Project planning with templates (kickoff, stakeholders, tasks, risks)
- Update agent model from GPT-4o to minimax-m2.1-free
- Update README with new skills

skill/plan-writing/references/component-guide.md

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+# Component Selection Guide
+
+Decision matrix for which templates to include based on project characteristics.
+
+## Decision Matrix
+
+| Question | If Yes | If No |
+|----------|--------|-------|
+| Team project (>1 person)? | +kickoff, +stakeholders | Use brief instead of kickoff |
+| Duration >2 weeks? | +risk-register | Skip risks |
+| External stakeholders? | +stakeholders (detailed) | Stakeholders optional |
+| Complex dependencies? | +detailed todos with deps | Simple todo list |
+| Ongoing tracking needed? | +progress-update template | One-time plan |
+
+## Quick Selection by Project Type
+
+### Solo, Short (<2 weeks)
+```
+✓ project-brief.md
+✓ todo-structure.md
+```
+
+### Solo, Medium (2-4 weeks)
+```
+✓ project-brief.md
+✓ todo-structure.md
+✓ risk-register.md
+```
+
+### Solo, Long (>4 weeks)
+```
+✓ project-brief.md (or kickoff for complex)
+✓ todo-structure.md
+✓ risk-register.md
+✓ progress-update.md (for self-tracking)
+```
+
+### Team, Any Duration
+```
+✓ project-kickoff.md (always for team alignment)
+✓ stakeholder-map.md
+✓ todo-structure.md
+✓ risk-register.md (if >2 weeks)
+✓ progress-update.md (for status updates)
+```
+
+## Template Purposes
+
+### project-kickoff.md
+Full 8-section document for team alignment:
+1. Project essentials (name, owner, dates)
+2. Goals and success criteria
+3. Stakeholders overview
+4. Timeline and milestones
+5. Scope (in/out)
+6. Risks overview
+7. Communication plan
+8. Next steps
+
+**Use when**: Multiple people need alignment on what/why/how.
+
+### project-brief.md
+1-page summary for simpler projects:
+- Goal statement
+- Success criteria
+- Key milestones
+- Initial tasks
+
+**Use when**: Solo project or simple scope that doesn't need formal kickoff.
+
+### stakeholder-map.md
+Communication matrix:
+- Who needs information
+- What they need to know
+- How often
+- Which channel
+
+**Use when**: Team projects with multiple stakeholders needing different information.
+
+### risk-register.md
+Risk tracking table:
+- Risk description
+- Probability (H/M/L)
+- Impact (H/M/L)
+- Mitigation plan
+- Owner
+
+**Use when**: Projects >2 weeks or high-stakes projects of any duration.
+
+### todo-structure.md
+Hierarchical task breakdown:
+- Phases or milestones
+- Tasks under each phase
+- Subtasks if needed
+- Metadata: owner, estimate, due date, dependencies
+
+**Use when**: Always. Every project needs task breakdown.
+
+### progress-update.md
+Status reporting template:
+- Completed since last update
+- In progress
+- Blockers
+- Next steps
+- Metrics/progress %
+
+**Use when**: Projects needing regular status updates (weekly, sprint-based, etc.).
+
+## Customization Notes
+
+Templates are starting points. Common customizations:
+- Remove sections that don't apply
+- Add project-specific sections
+- Adjust detail level based on audience
+- Combine templates for simpler output
+
+The goal is useful documentation, not template compliance.