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/brainstorming/references/thinking-frameworks.md

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+# Thinking Frameworks
+
+Use these when structured analysis adds value. Not every brainstorm needs a framework.
+
+## Pros/Cons Analysis
+
+**Best for**: Binary decisions (do X or not, choose A or B)
+
+| Option | Pros | Cons |
+|--------|------|------|
+| Option A | + Advantage 1 | - Disadvantage 1 |
+|          | + Advantage 2 | - Disadvantage 2 |
+| Option B | + Advantage 1 | - Disadvantage 1 |
+|          | + Advantage 2 | - Disadvantage 2 |
+
+**Tips**:
+- Weight factors by importance if not all equal
+- Consider: Which cons are dealbreakers?
+- Ask: What would make each option clearly better?
+
+## SWOT Analysis
+
+**Best for**: Strategic assessment of a situation, project, or decision
+
+|          | Helpful | Harmful |
+|----------|---------|---------|
+| **Internal** | **Strengths** | **Weaknesses** |
+|          | What advantages do we have? | What could we improve? |
+|          | What do we do well? | Where do we lack resources? |
+| **External** | **Opportunities** | **Threats** |
+|          | What trends could we exploit? | What obstacles exist? |
+|          | What gaps can we fill? | What is competition doing? |
+
+**Action mapping**:
+- Build on strengths
+- Address or mitigate weaknesses
+- Capture opportunities
+- Defend against threats
+
+## 5 Whys
+
+**Best for**: Finding root cause of a problem
+
+**Process**:
+1. **State the problem**: [What's happening?]
+2. **Why?** → [First answer]
+3. **Why?** → [Dig deeper]
+4. **Why?** → [Keep going]
+5. **Why?** → [Getting closer]
+6. **Why?** → [Root cause]
+
+**Tips**:
+- Stop when you reach something actionable
+- May take fewer or more than 5 iterations
+- Multiple branches possible (multiple "whys" at each level)
+
+**Example**:
+```
+Problem: Course launch didn't meet enrollment targets
+
+Why? → Not enough people saw the launch
+Why? → Email list is small
+Why? → Haven't been building audience consistently
+Why? → No content publishing schedule
+Why? → Haven't prioritized content creation
+→ Root cause: Need to establish content rhythm before next launch
+```
+
+## How-Now-Wow Matrix
+
+**Best for**: Prioritizing many ideas by feasibility and innovation
+
+|                    | Hard to Implement | Easy to Implement |
+|--------------------|-------------------|-------------------|
+| **Innovative**     | HOW (future investment) | WOW (prioritize these!) |
+| **Conventional**   | Why bother? | NOW (quick wins) |
+
+**Quadrant actions**:
+- **WOW**: Innovative + Easy = Do these first, high impact
+- **NOW**: Conventional + Easy = Quick wins, do soon
+- **HOW**: Innovative + Hard = Save for later, plan carefully
+- **Why bother?**: Conventional + Hard = Probably skip
+
+## Starbursting (6 Questions)
+
+**Best for**: Comprehensive exploration of an idea or decision
+
+Start with the idea in the center, then explore each question branch:
+
+### Who?
+- Who is affected?
+- Who will execute?
+- Who decides?
+- Who are stakeholders?
+
+### What?
+- What exactly are we doing?
+- What's the scope?
+- What's the deliverable?
+- What resources needed?
+
+### When?
+- When does it start?
+- When are milestones?
+- When is the deadline?
+- When do we review?
+
+### Where?
+- Where does this happen?
+- Where are resources?
+- Where will it be deployed/shared?
+
+### Why?
+- Why are we doing this?
+- Why now?
+- Why this approach?
+- Why does it matter?
+
+### How?
+- How will we execute?
+- How will we measure success?
+- How do we handle failures?
+- How do we communicate progress?
+
+## Constraint Mapping
+
+**Best for**: Understanding boundaries before generating solutions
+
+| Category | Constraints | Flexible? |
+|----------|-------------|-----------|
+| **Time** | Deadline, available hours | |
+| **Budget** | Money available, cost limits | |
+| **Resources** | People, skills, tools | |
+| **Technical** | Platform, compatibility, performance | |
+| **External** | Regulations, dependencies, stakeholders | |
+| **Preferences** | Must-haves, nice-to-haves | |
+
+**For each constraint, note**:
+- Is it truly fixed or negotiable?
+- What would change if we relaxed it?
+- Are there creative workarounds?
+
+## When NOT to Use Frameworks
+
+Skip frameworks when:
+- The decision is simple or obvious
+- Conversational exploration is working well
+- Time is very limited
+- The user just needs to talk through it
+
+**Default to conversation.** Suggest frameworks only when they'd genuinely help structure complex thinking.