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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+# Investor Update Skill
+
+This skill writes a complete investor update — structured for clarity, honest about challenges, and specific about asks. Output follows the format preferred by most early-stage and growth investors.
+
+## Required Inputs
+
+Ask the user for these if not provided:
+- **Company name and stage** (Seed / Series A / Series B / etc.)
+- **Period covered** (month or quarter)
+- **Key metrics this period** (revenue, MRR, users, churn, burn, runway — whatever's relevant)
+- **Biggest wins**
+- **Biggest challenges or misses**
+- **Specific asks from investors** (intros, advice, talent, partnerships)
+- **What's coming next period**
+- **Tone** (formal / conversational — most investors prefer conversational)
+
+## Output Structure
+
+---
+
+**[Company Name] — [Month/Quarter] Update**
+*[Date]*
+
+---
+
+Hi [Investor names or "all"],
+
+[One or two sentence opener — a specific highlight or honest framing of the period. Don't open with "Hope you're well." Open with the most important thing that happened.]
+
+---
+
+## The Numbers
+
+| Metric | This Period | Last Period | Change |
+|---|---|---|---|
+| [MRR / ARR] | [Value] | [Value] | [+/- %] |
+| [Active users / customers] | | | |
+| [Churn rate] | | | |
+| [Burn rate] | | | |
+| [Runway] | | | |
+| [Other key metric] | | | |
+
+[1–2 sentences of narrative on the numbers — what's the story behind the movement? Don't just repeat the table.]
+
+---
+
+## Highlights
+
+**[Highlight 1 — 4–6 word title]**
+[2–4 sentences. What happened. Why it matters. Be specific — name the customer, the number, the milestone.]
+
+**[Highlight 2]**
+[2–4 sentences]
+
+**[Highlight 3 — optional]**
+
+---
+
+## Challenges
+
+[This section is what separates trustworthy updates from self-promotional ones. Investors know you have challenges. Being direct builds trust.]
+
+**[Challenge 1]**
+[2–4 sentences. What the problem is. What you've tried. What you're doing about it. Don't spin — investors see through it.]
+
+**[Challenge 2 — if applicable]**
+
+---
+
+## Focus for Next [Month/Quarter]
+
+[3–5 bullet points. What you're concentrating on next period and why. Keep it tight — not an exhaustive roadmap.]
+
+- [Priority 1]
+- [Priority 2]
+- [Priority 3]
+
+---
+
+## Asks
+
+[Be specific. "Let me know if you can help" is not an ask. These should be actionable items an investor can act on immediately.]
+
+1. **[Ask type: e.g. Intro]** — [Specific request. e.g. "Looking for an intro to procurement leads at mid-market SaaS companies. Happy to share a warm intro note."]
+2. **[Ask type: e.g. Advice]** — [Specific question you want input on]
+3. **[Ask type: e.g. Talent]** — [Specific hire you're looking for — title, key requirements]
+
+---
+
+[Closing line — 1 sentence. Forward-looking or a genuine thanks. Not "as always, let me know if you have questions."]
+
+[Signature]
+[Name]
+[Company]
+[One way to reply — email / Calendly / reply to this thread]
+
+---
+
+## Writing Rules
+
+- Updates should take an investor 3–4 minutes to read. If it's longer, trim it.
+- Never lead with process ("This month we focused on...") — lead with outcomes
+- Challenges section must be honest. A missing challenges section signals the founder isn't self-aware or isn't being transparent.
+- Metrics table must include comparison to last period — a number without context is meaningless
+- Asks must be specific enough that an investor knows within 5 seconds if they can help
+- No jargon or buzzwords ("synergies," "crushing it," "hockey stick") — plain language only
+
+## Quality Checks
+
+- [ ] Opens with a specific highlight or honest framing (not a pleasantry)
+- [ ] Numbers include period-over-period comparison
+- [ ] Challenges section is present and honest
+- [ ] Asks are specific and actionable
+- [ ] Total length is skimmable in 3–4 minutes
+- [ ] No spin or buzzwords
+
+## Anti-Patterns
+
+- [ ] Do not omit challenges or bad news — sanitised updates erode investor trust faster than bad results do
+- [ ] Do not bury the lead — use BLUF structure and put the most important news in the first paragraph
+- [ ] Do not send an update without a clear "Ask" section — investors who want to help need to know how
+- [ ] Do not use buzzwords or spin — investors see hundreds of updates and will see through vague positive language
+- [ ] Do not report metrics without a comparison baseline — numbers without context (vs. last period or target) are meaningless
+
+## Example Trigger Phrases
+
+- "Write an investor update for [month/quarter]"
+- "Draft a monthly update for our investors based on these notes: [paste notes]"
+- "Help me write a board update for Q[N]"
+- "Write our Series A investor newsletter"