docs: add RELEASES.md + cross-project coordination section to CLAUDE.md

RELEASES.md

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+# @soulcraft/brainy — Release Notes for Consumers
+
+This file is the **quick reference for Soulcraft product sessions** tracking Brainy changes.
+Full auto-generated changelog: `CHANGELOG.md` · Releases: https://github.com/soulcraftlabs/brainy/releases
+
+**How to use:** Brainy is the underlying data engine for Workshop, Venue, Academy, and
+Collective. The SDK wraps it — most products never call Brainy directly. Read this when:
+- Upgrading `@soulcraft/brainy` in the SDK or a product
+- Debugging data, query, or storage behaviour
+- A new Brainy feature is available that SDK should expose
+
+---
+
+## v7.19.10 — 2026-02-24
+
+**Affected products:** All Bun/ESM consumers (Workshop, Venue, Academy, SDK)
+
+### ESM crypto fix in SSTable
+
+Replaced `require('crypto')` with `import { createHash } from 'node:crypto'` in the
+SSTable implementation. Fixes a crash in Bun and strict ESM environments where
+CommonJS `require` is unavailable.
+
+No API changes — upgrade and redeploy.
+
+---
+
+## v7.19.2 — 2026-02-18
+
+**Affected products:** All
+
+### Metadata index cleanup on delete
+
+Fixed: metadata indexes were not cleaned up after `delete()` / `deleteMany()`. Stale
+index entries could cause phantom results in metadata-filtered queries after deletion.
+
+No API changes. If you were seeing ghost results in filtered queries, this fixes it.
+
+---
+
+## v7.18.0 — 2026-02-16
+
+**Affected products:** Workshop, Venue, Academy (analytics, reporting, session summaries)
+
+### Aggregation engine
+
+New `brain.aggregate()` API — incremental SUM, COUNT, AVG, MIN, MAX with GROUP BY
+and time window support. Computes over entity collections without loading all records
+into memory.
+
+```typescript
+const result = await brain.aggregate({
+  collection: 'bookings',
+  metrics: [
+    { field: 'revenue', fn: 'SUM' },
+    { field: 'id', fn: 'COUNT' },
+  ],
+  groupBy: 'staffId',
+  timeWindow: { field: 'createdAt', from: startOfMonth, to: now },
+})
+```
+
+SDK exposure: `sdk.brainy.aggregate()` — available once SDK is updated to pass through.
+
+---
+
+## v7.17.0 — 2026-02-09
+
+**Affected products:** All (schema evolution, data migrations)
+
+### Migration system
+
+New `brain.migrate()` API with error handling, validation, and enterprise hardening.
+Run schema migrations reliably across Brainy data directories.
+
+```typescript
+await brain.migrate({
+  version: 3,
+  up: async (brain) => {
+    // transform entities, rename fields, etc.
+  },
+})
+```
+
+---
+
+## v7.16.0 — 2026-02-09
+
+**Affected products:** All
+
+### Data/metadata separation enforced + numeric range queries
+
+- Entity `data` and `metadata` fields are now strictly separated at the storage layer
+- Numeric range queries now supported in metadata filters: `{ age: { $gte: 18, $lt: 65 } }`
+- Fixes edge cases where mixed data/metadata storage caused inconsistent query results
+
+**Breaking for anyone storing numeric values in metadata and relying on range queries:**
+verify your filter syntax matches the new `$gte/$lte/$gt/$lt` operators.
+
+---
+
+## v7.15.5 — 2026-02-02
+
+**Affected products:** Anyone using `@soulcraft/cortex` plugin
+
+### Plugin opt-in clarified
+
+Cortex and other plugins are opt-in. Pass explicitly:
+```typescript
+new Brainy({ plugins: ['@soulcraft/cortex'] })
+```
+Without `plugins`, no external plugins are loaded regardless of what's installed.
+
+---
+
+## v7.15.2 — 2026-02-01
+
+**Affected products:** All (data safety)
+
+### Graph LSM flush on close
+
+Fixed: graph LSM-trees were not flushed on `brain.close()`, risking data loss across
+restarts. Graph edges written in the final seconds before shutdown are now guaranteed
+to be persisted.
+
+No API changes — upgrade immediately if running Brainy in a long-lived server process.