chore: move telemetry MD docs to follow-up PR

Remove docs/TELEMETRY.md, spec/telemetry-design.md,
spec/telemetry-sprint-plan.md, spec/telemetry-test-completion-summary.md
and revert README.md — these ~4.9k lines of markdown are being
split into a stacked docs-only PR on top of this branch to keep the
[4/7] diff focused on code.

Co-authored-by: Isaac
Signed-off-by: samikshya-chand_data <samikshya.chand@databricks.com>

Author: samikshya-db

README.md

@@ -51,53 +51,6 @@ client
   });
 ```
 
-## Telemetry
-
-The Databricks SQL Driver for Node.js includes an **opt-in telemetry system** that collects driver usage metrics and performance data to help improve the driver. Telemetry is **disabled by default** and follows a **privacy-first design**.
-
-### Key Features
-
-- **Privacy-first**: No SQL queries, results, or sensitive data is ever collected
-- **Opt-in**: Controlled by server-side feature flag (disabled by default)
-- **Non-blocking**: All telemetry operations are asynchronous and never impact your queries
-- **Resilient**: Circuit breaker protection prevents telemetry failures from affecting your application
-
-### What Data is Collected?
-
-When enabled, the driver collects:
-
-- ✅ Driver version and configuration settings
-- ✅ Query performance metrics (latency, chunk counts, bytes downloaded)
-- ✅ Error types and status codes
-- ✅ Feature usage (CloudFetch, Arrow format, compression)
-
-**Never collected**:
-
-- ❌ SQL query text
-- ❌ Query results or data values
-- ❌ Table/column names or schema information
-- ❌ User credentials or personal information
-
-### Configuration
-
-To enable or disable telemetry explicitly:
-
-```javascript
-const client = new DBSQLClient({
-  telemetryEnabled: true, // Enable telemetry (default: false)
-});
-
-// Or override per connection:
-await client.connect({
-  host: '********.databricks.com',
-  path: '/sql/2.0/warehouses/****************',
-  token: 'dapi********************************',
-  telemetryEnabled: false, // Disable for this connection
-});
-```
-
-For detailed documentation including configuration options, event types, troubleshooting, and privacy details, see [docs/TELEMETRY.md](docs/TELEMETRY.md).
-
 ## Run Tests
 
 ### Unit tests