Add milestone planning phase between /generate-app and /add-feature

- New command /plan-milestones: generates docs/milestones/ (roadmap.md + one document per milestone with its features, acceptance criteria, and ready-to-run /add-feature commands)
- New skill milestone-planning: MVP-first vertical-slice planning rules + milestone/roadmap templates
- /add-feature: reads the feature's milestone document before planning and checks the feature off (updating milestone/roadmap status) in Step 8
- Workflow diagrams, CLAUDE.md, README, and settings.json updated for the new phase

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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---
name: milestone-planning
description: Guide for planning development milestones and generating milestone documents with a feature breakdown. Use when planning milestones, a release roadmap, or deciding implementation order under docs/milestones/.
allowed-tools: Read, Write, Edit
---
# Milestone Planning Skill
This skill explains how to break a product into ordered milestones and produce milestone documents under `docs/milestones/`. The documents are the bridge between the specification (`docs/`) and implementation (`/add-feature`): every feature in every milestone is sized to be implemented with **one `/add-feature` run**.
## Core Principles
1. **MVP first**: Milestone 1 is the smallest coherent, end-to-end usable product. Not a layer (e.g. "all the models"), but a vertical slice a user could actually use.
2. **Vertical slices**: Each feature cuts through UI → logic → data. Avoid horizontal milestones like "backend milestone" / "frontend milestone".
3. **One feature = one `/add-feature` run**: If a feature needs more than one steering directory to implement, split it. If it is a one-line change, merge it into a neighbor.
4. **Dependency order**: A feature never lands in an earlier milestone than something it depends on.
5. **Exactly-once assignment**: Every feature belongs to exactly one milestone. Deliberately deferred items go to the roadmap's "Later / Icebox" — nothing silently disappears.
6. **Living documents**: Milestone documents track status. `/add-feature` checks off a feature (`[ ]``[x]`) when it completes, and the roadmap status is updated when a milestone finishes.
## Inputs
Before planning, read:
- `docs/product-requirements.md` — user stories, priorities (P0/P1/P2), success metrics
- `docs/functional-design.md` — functional modules and data flows
- `docs/architecture.md` — technical constraints and dependencies
- `docs/design/ui-blueprint.json` (if present) — screens and user actions
- `docs/ideas/*` (if present)
## Outputs
```
docs/milestones/
├── roadmap.md # Overview: milestone table, ordering rationale, icebox
├── milestone-01-[name].md # MVP
├── milestone-02-[name].md
└── milestone-NN-[name].md
```
File naming: `milestone-[NN]-[kebab-case-name].md` (e.g. `milestone-01-mvp.md`, `milestone-02-collaboration.md`).
Use the structure in `template.md` for each milestone document.
## How to Slice Features
A well-sized feature:
- Delivers observable user value (or unblocks one that does)
- Touches one primary screen/flow (may touch shared components)
- Has 37 acceptance criteria
- Can be described in one sentence starting with a verb ("Edit user profile", "Filter tasks by tag")
- Works verbatim as a command argument: `/add-feature Edit user profile`
Too big (split it): "User management" → "Register account", "Log in / log out", "Edit user profile", "Reset password".
Too small (merge it): "Change button color" → fold into the feature that owns that screen.
## How to Group Milestones
1. Tag every feature with its PRD priority and its dependencies.
2. Milestone 1 (MVP): the minimal dependency-closed set of P0 features that forms a usable product walk-through (a user can start, do the core job, and finish).
3. Following milestones: group remaining features by theme and priority, keeping each milestone a meaningful release on its own ("after milestone N ships, the user can additionally …").
4. Prefer 24 milestones with 38 features each. More than ~8 features in one milestone usually means it should be split.
## Status Tracking Rules
- Feature status lives **only** in the feature checkbox of its milestone document.
- Milestone status (`Not started` / `In progress` / `Completed`) lives in both the milestone document header and the roadmap table — keep them in sync.
- `/add-feature` Step 8 updates the feature checkbox and, when the last feature of a milestone completes, the milestone and roadmap statuses.
- Re-planning (adding/moving/removing features) must update both the milestone document(s) and `roadmap.md` in the same change.
## Consistency Checklist
Before finishing:
- [ ] Every P0/P1 PRD requirement maps to a feature in some milestone (or is explicitly in the icebox).
- [ ] Every feature appears in exactly one milestone.
- [ ] No feature precedes one of its dependencies.
- [ ] Milestone 1 is a usable end-to-end product on its own.
- [ ] Every feature has acceptance criteria and a ready-to-run `/add-feature` command line.
- [ ] `roadmap.md` table matches the milestone documents (names, counts, statuses).

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# Milestone Document Template
Use this structure for each `docs/milestones/milestone-[NN]-[name].md`.
```markdown
# Milestone [NN]: [Name]
**Status**: Not started | In progress | Completed
**Goal**: [One sentence: what the user can do after this milestone that they could not before]
## Scope
### In Scope
- [Theme or capability included in this milestone]
### Out of Scope
- [Explicitly excluded item] → [where it lives instead: milestone NN / icebox]
## Dependencies
- [What must exist before this milestone can start: previous milestone, external system, decision]
## Features
> One `/add-feature` run per feature. Check off each feature when its run completes.
- [ ] [Feature 1 name]
- [ ] [Feature 2 name]
- [ ] [Feature 3 name]
### Feature: [Feature 1 name]
- **Description**: [What it does and the user value, 13 sentences]
- **Related requirements**: [PRD user story / requirement IDs or headings]
- **Affected screens**: [screen ids from ui-blueprint.json, or "n/a"]
- **Acceptance criteria**:
- [Criterion 1]
- [Criterion 2]
- [Criterion 3]
- **Command**: `/add-feature [Feature 1 name]`
### Feature: [Feature 2 name]
- **Description**: ...
- **Related requirements**: ...
- **Affected screens**: ...
- **Acceptance criteria**:
- ...
- **Command**: `/add-feature [Feature 2 name]`
## Definition of Done
- [ ] All features above are checked off
- [ ] `npm test`, `npm run lint`, `npm run typecheck` pass
- [ ] Persistent documents in `docs/` are reconciled with all features
- [ ] [Milestone-specific criterion, e.g. "demo flow X→Y→Z works end-to-end"]
## Completion Notes
_Filled in when the milestone completes: completion date, deviations from plan, lessons learned._
```
# Roadmap Template
Use this structure for `docs/milestones/roadmap.md`.
```markdown
# Development Roadmap
**Current milestone**: [NN — name]
## Milestones
| # | Name | Goal | Features | Status |
|---|------|------|----------|--------|
| 01 | [name] | [one-line goal] | [count] | Not started / In progress / Completed |
| 02 | [name] | [one-line goal] | [count] | Not started |
## Ordering Rationale
[Why this sequence: MVP definition, dependency chains, priority decisions made with the user]
## Later / Icebox
Consciously deferred — revisit when re-planning:
- [Deferred item] — [why deferred]
```