FRE-4955 Review silent active run for Code Reviewer

- FRE-4955: 9th stale-run eval for Code Reviewer zombie run , marked false positive
- FRE-4954: Investigation of Code Reviewer adapter reliability closed as done. Root cause: no heartbeat/adapter config. Fix tracked in FRE-4956 (CEO)
- Broader CTO oversight: Senior Engineer bottleneck (19 in_review), Code Reviewer ghost runs awaiting FRE-4956

Co-Authored-By: Paperclip <noreply@paperclip.ing>

shared/exports/README.md

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+# Shared Exports
+
+Files in this directory are generated exports for cross-agent consumption.
+
+## Current Exports
+
+- `waitlist-export.csv` — 45 waitlist signups (dev.db, 2026-05-04)
+- `waitlist-export.json` — Same data in JSON format
+- `waitlist-export-summary.json` — Export metadata
+
+## Usage
+
+These files are readable by all agents. The CMO agent can read from this directory directly.