feat(opencode): vendor ten marketing and copy skills

- Copy product-marketing, copywriting, copy-editing, emails,
  cold-email, content-strategy, seo-audit, ai-seo, launch and social
  unchanged from coreyhaines31/marketingskills at b9ba399, with its MIT
  license in each directory
- link-ai-configs.sh links each into the OpenCode, Claude Code and omo
  skill directories
- Document provenance and the upgrade path in the OpenCode README

.config/opencode/skills/copy-editing/references/checklist.md

@@ -0,0 +1,77 @@
+# Copy Editing Checklist
+
+Use this checklist alongside the Seven Sweeps Framework (see SKILL.md) as a final QA pass before delivering edited copy.
+
+## Before You Start
+
+- [ ] Understand the goal of this copy
+- [ ] Know the target audience
+- [ ] Identify the desired action
+- [ ] Read through once without editing
+
+## Clarity (Sweep 1)
+
+- [ ] Every sentence is immediately understandable
+- [ ] No jargon without explanation
+- [ ] Pronouns have clear references
+- [ ] No sentences trying to do too much
+
+## Voice & Tone (Sweep 2)
+
+- [ ] Consistent formality level throughout
+- [ ] Brand personality maintained
+- [ ] No jarring shifts in mood
+- [ ] Reads well aloud
+
+## So What (Sweep 3)
+
+- [ ] Every feature connects to a benefit
+- [ ] Claims answer "why should I care?"
+- [ ] Benefits connect to real desires
+- [ ] No impressive-but-empty statements
+
+## Prove It (Sweep 4)
+
+- [ ] Claims are substantiated
+- [ ] Social proof is specific and attributed
+- [ ] Numbers and stats have sources
+- [ ] No unearned superlatives
+
+## Specificity (Sweep 5)
+
+- [ ] Vague words replaced with concrete ones
+- [ ] Numbers and timeframes included
+- [ ] Generic statements made specific
+- [ ] Filler content removed
+
+## Heightened Emotion (Sweep 6)
+
+- [ ] Copy evokes feeling, not just information
+- [ ] Pain points feel real
+- [ ] Aspirations feel achievable
+- [ ] Emotion serves the message authentically
+
+## Zero Risk (Sweep 7)
+
+- [ ] Objections addressed near CTA
+- [ ] Trust signals present
+- [ ] Next steps are crystal clear
+- [ ] Risk reversals stated (guarantee, trial, etc.)
+
+## AI Tells
+
+- [ ] No "it's not X, it's Y" or "not because X, because Y" reveals
+- [ ] No "no X, no Y, no Z" negation lists
+- [ ] No sentences that trail restating comma clauses after the main claim (a clause adding a new fact is fine)
+- [ ] No self-answered questions or colon reveals (FAQ questions and a reader's own question are fine)
+- [ ] No stock openers or phrases ("In today's...", "Whether you're...", "Say goodbye to...")
+- [ ] No em dashes in headlines, subheads, CTAs, ads, social posts, or subject lines; 1–2 per page max in long copy
+- [ ] At most one fragment and one list of three per section (CTA microcopy and real three-feature lists don't count)
+- [ ] Every vague adjective replaced with the fact it stood for
+
+## Final Checks
+
+- [ ] No typos or grammatical errors
+- [ ] Consistent formatting
+- [ ] Links work (if applicable)
+- [ ] Core message preserved through all edits