docs(marketing): add posting guide for Discord adapter announcement

Document where to post (Reddit r/LocalLlama, r/ML, dev.to), required
credentials, and current status. All committed to staging.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/marketing/campaigns/discord-adapter-announcement/posting-guide.md

@@ -0,0 +1,58 @@
+# Posting Guide — Discord Adapter Announcement
+## Issue #1183 / PR #656
+
+**Announcement file:** `announcement.md`
+**Status:** Issue CLOSED. Announcement committed to `staging` and pushed.
+**Pending:** Posting to Reddit + dev.to (no API credentials available — needs Social Media Brand)
+
+---
+
+## Where to Post
+
+### 1. Reddit — r/LocalLlama
+**Why:** Active developer community for AI agent tooling. MCP + browser automation is on-topic.
+**Format:** Text post with short title + announcement body
+**Title suggestion:** "Molecule AI Discord adapter is live — slash commands + outbound webhooks, no bot token needed"
+**Link to add:** https://github.com/Molecule-AI/molecule-core/pull/656
+
+### 2. Reddit — r/MachineLearning
+**Why:** Broader AI/ML developer audience. Platform announcements are on-topic.
+**Format:** Same as above
+**Note:** Less technical than r/LocalLlama — shorten the code example
+
+### 3. dev.to
+**Why:** Developer blogging platform with strong AI/agent community.
+**API:** `POST https://dev.to/api/articles` with `api_key` header
+**Credentials needed:** `DEV_TO_API_KEY` env var or token store
+**Frontmatter format needed:**
+```yaml
+---
+title: "Molecule AI Discord Adapter: Slash Commands + Outbound Webhooks for AI Agents"
+published: true
+tag_list: "AI, Python, MCP, Discord, Bots"
+---
+```
+
+### 4. Molecule AI Discord Server (informational)
+**Server:** https://discord.com/invite/molecule-ai
+**Channel suggestion:** `#announcements` or `#general`
+**Note:** The Discord adapter sends TO Discord — this is an announcement about it, not using it to announce. Consider whether this announcement belongs in Discord or just external channels.
+
+---
+
+## What Was Already Done
+- [x] Issue #1183 closed
+- [x] `docs/agent-runtime/social-channels.md` updated (Discord → ✅ Implemented)
+- [x] Discord Setup section added to social-channels doc
+- [x] Announcement draft written
+- [x] All committed to `staging` and pushed to origin
+
+## What Needs Doing
+- [ ] Post announcement to Reddit r/LocalLlama (needs credentials)
+- [ ] Post announcement to Reddit r/MachineLearning (needs credentials)
+- [ ] Post announcement to dev.to (needs `DEV_TO_API_KEY`)
+- [ ] Coordinate with Social Media Brand on thread #1182 timing
+
+---
+
+*Created 2026-04-20 by Content Marketer*