docs: add sponsorship playbook and monthly metrics automation

docs/business/social-launch-copy.md

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+# Social Launch Copy (X + LinkedIn)
+
+Use these templates as launch-ready starting points. Replace placeholders before posting.
+
+## X Post: Release Announcement
+
+```text
+ECC v1.8.0 is live.
+
+We moved from “config pack” to an agent harness performance system:
+- hook reliability fixes
+- new harness commands
+- cross-tool parity (Claude Code, Cursor, OpenCode, Codex)
+
+Start here: <repo-link>
+```
+
+## X Post: Proof + Metrics
+
+```text
+If you evaluate agent tooling, use blended distribution metrics:
+- npm installs (`ecc-universal`, `ecc-agentshield`)
+- GitHub App installs
+- repo adoption (stars/forks/contributors)
+
+We now track this monthly in-repo for sponsor transparency.
+```
+
+## X Quote Tweet: Eval Skills Article
+
+```text
+Strong point on eval discipline.
+
+In ECC we turned this into production checks via:
+- /harness-audit
+- /quality-gate
+- Stop-phase session summaries
+
+This is where harness performance compounds over time.
+```
+
+## X Quote Tweet: Plankton / deslop workflow
+
+```text
+This workflow direction is right: optimize the harness, not just prompts.
+
+Our v1.8.0 focus was reliability + parity + measurable quality gates across toolchains.
+```
+
+## LinkedIn Post: Partner-Friendly Summary
+
+```text
+We shipped ECC v1.8.0 with one objective: improve agent harness performance in production.
+
+Highlights:
+- more reliable hook lifecycle behavior
+- new harness-level quality commands
+- parity across Claude Code, Cursor, OpenCode, and Codex
+- stronger sponsor-facing metrics tracking
+
+If your team runs AI coding agents daily, this is designed for operational use.
+```