Add multi-platform export generator (single source of truth)

Make the library multi-platform without duplicating content. Each
skills/<name>/SKILL.md body remains the single source of truth; a new
generator renders platform-ready exports from it.

- scripts/build-exports.mjs — dependency-free Node generator with a PLATFORMS
  registry so new platforms (Gemini, Cursor, …) are a few lines. Ships ChatGPT
  exports at exports/chatgpt/<bundle>/<skill>/SYSTEM_PROMPT.md (172 skills),
  plus generated index READMEs. Supports --platform and --check.
- exports/ — generated ChatGPT system prompts, ready to paste into a Custom GPT.
- .github/workflows/check-generated.yml — fails a PR if exports or
  web/skills.json drift from the source skills.
- README "Works With" now documents the ready-to-use exports and regen command.
- CHANGELOG + SKILL-AUTHORING-STANDARD note the generated artifacts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016JWn5jRD5tcEFKrubjQ6Px
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Claude
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# OKR Builder Skill
Write ambitious, measurable OKRs that connect product work to company strategy. Avoid vanity metrics, output-focused key results, and objectives that sound like task lists.
## OKR Fundamentals
**Objective:** Qualitative, inspiring, time-bound. Answers "where are we going?"
**Key Result:** Quantitative, specific, measurable. Answers "how will we know we've arrived?"
### The Test for a Good KR
- Can it be scored 0.01.0 at the end of the period?
- Does it measure outcome, not output? ("Revenue from new customers increased by 30%" not "Launch 3 features")
- Is it ambitious but achievable? (Aim for 70% attainment as the gold standard)
- Is it within the team's control?
## Common OKR Anti-Patterns to Flag and Fix
| Anti-Pattern | Example | Better Version |
|---|---|---|
| Task masquerading as KR | "Launch onboarding redesign" | "New user activation rate increases from 42% to 65%" |
| Vanity metric | "Get 10,000 app downloads" | "30-day retention for new users reaches 40%" |
| Binary KR | "Ship API v2" | "API v2 adopted by 80% of active integrations" |
| Too many KRs | 6+ per objective | Max 34 KRs per objective |
| No baseline | "Improve NPS" | "NPS increases from 32 to 50" |
Always flag anti-patterns and offer a rewrite.
## Output Format
### [Quarter] OKRs — [Team/Product Area]
---
**Objective 1: [Inspiring, qualitative statement]**
*Why this matters:* [12 sentence strategic context]
| # | Key Result | Baseline | Target | Measurement Method |
|---|---|---|---|---|
| KR1 | [Measurable outcome] | [Current state] | [Target] | [How measured] |
| KR2 | [Measurable outcome] | [Current state] | [Target] | [How measured] |
| KR3 | [Measurable outcome] | [Current state] | [Target] | [How measured] |
*Owner:* [Name/Role]
*Check-in cadence:* Weekly
---
Repeat for each objective. Recommend 24 objectives per team per quarter.
## Scoring Guide to Include
At quarter end, score each KR:
- 0.71.0 = Excellent (0.7 is the "sweet spot" — if all KRs score 1.0, they weren't ambitious enough)
- 0.40.6 = Made progress but missed
- 0.00.3 = Missed — needs retrospective discussion
## Required Inputs
Ask the user for these if not provided:
- **Team or individual** the OKRs are for
- **Quarter and year**
- **Company or product North Star metric** (OKRs should connect to this)
- **Top 3 priorities or goals for this quarter** (rough notes are fine)
- **Any existing OKRs to review or improve** (optional)
## Guidelines
- Always ask for the company-level or product-level North Star metric before writing OKRs
- Recommend no more than 3 objectives per team per quarter
- If user provides output-based goals, always reframe as outcomes
- Include a "health check" section flagging which KRs have no current baseline data
- Remind user: OKRs are not performance reviews — they should be ambitious enough that missing them is okay
## Quality Checks
- [ ] Each KR is measurable with a baseline and target
- [ ] No output-based KRs (no "launch X" or "complete Y")
- [ ] Maximum 4 KRs per objective
- [ ] OKRs connect to the company or product North Star
- [ ] Ambitious enough that 0.7 attainment is the expected score
## Anti-Patterns
- [ ] Do not accept output-based key results — any KR phrased as "launch X" or "complete Y" must be rewritten as an outcome with a baseline and target
- [ ] Do not write OKRs without asking for the company or product North Star — OKRs disconnected from the strategic context are just a goal-setting exercise
- [ ] Do not write more than 4 KRs per objective — too many KRs dilute focus and make scoring ambiguous at quarter end
- [ ] Do not use binary KRs (ship/don't ship) — every KR must be scorable on a 0.01.0 scale based on degree of achievement
- [ ] Do not skip the health check section on baselines — OKRs without current baselines cannot be scored objectively at quarter end