Improve copilot code review instructions

Author: shahzaibj

.github/copilot-instructions.md

@@ -25,7 +25,7 @@ Common provides cross-repository primitives:
 - OAuth2/OIDC protocol request/response handling.
 - Token cache, serialization, normalization (authority, environment, FOCI).
 - Cryptography utilities (KeyStore, key wrapping, hashing, JWE/JWS support).
-- Telemetry enums (SpanName, AttributeName, DataClassification) and instrumentation helpers.
+- Telemetry enums (SpanName, AttributeName) and instrumentation helpers.
 - IPC contracts & shared data models.
 - Cloud instance & regional authority discovery and validation.
 - Error taxonomy & mapping.
@@ -87,9 +87,8 @@ Common provides cross-repository primitives:
 - No plaintext private keys in SharedPreferences; KeyStore usage required.
 - Key rotation atomic: old key decommission only after new key validated.
 
-### 1.9 Telemetry Enums & DataClassification
+### 1.9 Telemetry Enums
 - AttributeName constants carry classification; new requires doc + rationale.
-- Classification categories: SystemMetadata, OrganizationIdentifiableInformation, EndUserPseudonymousIdentifiers (never raw PII).
 - Adding attribute: uniqueness, bounded cardinality, doc comment specifying value domain & units.
 - Reuse existing SpanName for similar semantics; avoid duplication.
 
@@ -383,7 +382,7 @@ Before adding:
 Checklist:
 1. Does an existing `AttributeName` already cover this semantic? If yes, reuse.
 2. Is the value stable, low/controlled cardinality, and privacy-compliant?
-3. Determine correct `DataClassification` (e.g., `SystemMetadata`, `EndUserPseudonymousIdentifiers`).
+3. Each attribute added to `AttributeName` MUST also be defined in the `AttributeName` file in the broker repo for cross-repo consistency. (Leave a comment reminding to do so.)
 4. For times/durations: prefer separate numeric metrics (ms) or mark `isDateTime=true` when representing an instant.
 5. Add Javadoc describing purpose and (if applicable) expected value set.
 6. Update any downstream dashboards or processing rules if necessary.