feat: add generic content and investor skills

skills/content-engine/SKILL.md

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+---
+name: content-engine
+description: Create platform-native content systems for X, LinkedIn, TikTok, YouTube, newsletters, and repurposed multi-platform campaigns. Use when the user wants social posts, threads, scripts, content calendars, or one source asset adapted cleanly across platforms.
+origin: ECC
+---
+
+# Content Engine
+
+Turn one idea into strong, platform-native content instead of posting the same thing everywhere.
+
+## When to Activate
+
+- writing X posts or threads
+- drafting LinkedIn posts or launch updates
+- scripting short-form video or YouTube explainers
+- repurposing articles, podcasts, demos, or docs into social content
+- building a lightweight content plan around a launch, milestone, or theme
+
+## First Questions
+
+Clarify:
+- source asset: what are we adapting from
+- audience: builders, investors, customers, operators, or general audience
+- platform: X, LinkedIn, TikTok, YouTube, newsletter, or multi-platform
+- goal: awareness, conversion, recruiting, authority, launch support, or engagement
+
+## Core Rules
+
+1. Adapt for the platform. Do not cross-post the same copy.
+2. Hooks matter more than summaries.
+3. Every post should carry one clear idea.
+4. Use specifics over slogans.
+5. Keep the ask small and clear.
+
+## Platform Guidance
+
+### X
+- open fast
+- one idea per post or per tweet in a thread
+- keep links out of the main body unless necessary
+- avoid hashtag spam
+
+### LinkedIn
+- strong first line
+- short paragraphs
+- more explicit framing around lessons, results, and takeaways
+
+### TikTok / Short Video
+- first 3 seconds must interrupt attention
+- script around visuals, not just narration
+- one demo, one claim, one CTA
+
+### YouTube
+- show the result early
+- structure by chapter
+- refresh the visual every 20-30 seconds
+
+### Newsletter
+- deliver one clear lens, not a bundle of unrelated items
+- make section titles skimmable
+- keep the opening paragraph doing real work
+
+## Repurposing Flow
+
+Default cascade:
+1. anchor asset: article, video, demo, memo, or launch doc
+2. extract 3-7 atomic ideas
+3. write platform-native variants
+4. trim repetition across outputs
+5. align CTAs with platform intent
+
+## Deliverables
+
+When asked for a campaign, return:
+- the core angle
+- platform-specific drafts
+- optional posting order
+- optional CTA variants
+- any missing inputs needed before publishing
+
+## Quality Gate
+
+Before delivering:
+- each draft reads natively for its platform
+- hooks are strong and specific
+- no generic hype language
+- no duplicated copy across platforms unless requested
+- the CTA matches the content and audience