Add installable create-plan skills for codex, claude-code, and opencode

skills/create-plan/claude-code/templates/story-tracker.md

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+# Story Tracker: [Plan Title]
+
+## Progress Summary
+- **Current Milestone:** M1
+- **Stories Complete:** 0/N
+- **Milestones Approved:** 0/M
+- **Last Updated:** YYYY-MM-DD
+
+---
+
+## Milestones
+
+### M1: [Name]
+
+| Story | Description | Status | Notes |
+|-------|-------------|--------|-------|
+| S-101 | [Brief description] | pending | |
+| S-102 | [Brief description] | pending | |
+| S-103 | [Brief description] | pending | |
+
+**Approval Status:** pending
+
+---
+
+### M2: [Name]
+
+| Story | Description | Status | Notes |
+|-------|-------------|--------|-------|
+| S-201 | [Brief description] | pending | |
+| S-202 | [Brief description] | pending | |
+| S-203 | [Brief description] | pending | |
+
+**Approval Status:** pending
+
+---
+
+## Status Legend
+
+| Status | Meaning |
+|--------|---------|
+| `pending` | Not started |
+| `in-dev` | Currently being worked on |
+| `completed` | Done - include commit hash in Notes |
+| `deferred` | Postponed - include reason in Notes |
+
+## Update Instructions (MANDATORY)
+
+Before starting any story:
+1. Mark story as `in-dev`
+2. Update "Last Updated"
+
+After completing any story:
+1. Mark story as `completed`
+2. Add local commit hash to Notes
+3. Update "Stories Complete" and "Last Updated"
+
+At milestone boundary:
+1. Run lint/typecheck/tests for changed files
+2. Commit (no push)
+3. Request feedback
+4. Apply feedback, re-check changed files, commit again
+5. Mark milestone **Approval Status: approved** only after user confirms
+6. Continue only after approval
+
+After all milestones approved:
+- Ask permission to push and then mark plan completed.