feat: add product slash commands

commands/prd.md

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+---
+name: prd
+description: Quick PRD generation command. Usage: /prd <feature-or-problem>
+---
+
+# /prd
+
+Generate a concise product requirements document for a feature, initiative, or problem statement.
+
+## Usage
+
+```bash
+/prd <feature-or-problem>
+```
+
+## Output Structure
+
+- Problem statement
+- Goals and non-goals
+- User stories and acceptance criteria
+- Metrics and success thresholds
+- Scope and timeline assumptions
+
+## Skill Reference
+- `product-team/product-manager-toolkit/SKILL.md`

commands/sprint-plan.md

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+---
+name: sprint-plan
+description: Sprint planning shortcut. Usage: /sprint-plan <goal> [capacity]
+---
+
+# /sprint-plan
+
+Create a sprint plan with prioritized stories and capacity guardrails.
+
+## Usage
+
+```bash
+/sprint-plan <goal> [capacity]
+```
+
+## Output Structure
+
+- Sprint goal
+- Committed scope
+- Stretch scope
+- Risks and dependencies
+- Story-level acceptance criteria checks
+
+## Skill Reference
+- `product-team/agile-product-owner/SKILL.md`