fix(otel): address lint and test regressions from C1/C2 fixes

- Prefix unused opts param with _opts in bindOtelInstrumentation (ESLint)
- Extend IPv6 regex to cover prefix::suffix form (e.g. 2001:0db8::1) so
  the IPv6 scrub test passes correctly
- Delete orphaned sentry-pii-scrubber.test.ts files from apps/cms and
  apps/web-tanstack that imported the deleted sentry/scrub module (broke
  typecheck; the OTel-layer replacement tests are in pii-scrub-processor.test.ts)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-shared/src/instrumentation/di/bind-otel-instrumentation.ts

@@ -24,7 +24,9 @@ export type BindOtelOpts = {
  */
 export function bindOtelInstrumentation(
   container: Container,
-  opts: BindOtelOpts,
+  // opts is accepted for API compatibility with call sites that still pass dsn + app.
+  // The SDK is initialized by instrumentation.ts register() — no fields are used here.
+  _opts: BindOtelOpts,
 ): { tracer: ITracer; logger: ILogger; metrics: IMetrics } {
   const tracer = new OtelTracer();
   const logger = new OtelLogger();

packages/core-shared/src/instrumentation/otel/pii-fields.ts

@@ -44,10 +44,17 @@ export const PII_QUERY_PARAM_SUBSTRINGS = [
 export const REDACTED_VALUE = "[redacted]" as const;
 export const REDACTED_IP = "[redacted-ip]" as const;
 
-// IPv4: simple dotted-quad; IPv6: any colon-separated hex with at least one ::
+// IPv4: simple dotted-quad.
 export const IPV4_REGEX = /\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/g;
+
+// IPv6: covers the three common forms:
+//   1. Full / no-:: form:       2001:0db8:0000:0000:0000:0000:0000:0001
+//   2. Compressed prefix::rest: 2001:0db8::1  (one or more groups before ::)
+//   3. Leading ::suffix:        ::1  or  ::ffff:192.0.2.1
+// The alternation order puts the longer prefix:: pattern first so it captures
+// the full address rather than leaving the prefix unmatched.
 export const IPV6_REGEX =
-  /\b(?:[0-9a-fA-F]{1,4}:){2,7}[0-9a-fA-F]{1,4}\b|::(?:[0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4}/g;
+  /\b(?:[0-9a-fA-F]{1,4}:){1,7}:[0-9a-fA-F]{0,4}\b|\b(?:[0-9a-fA-F]{1,4}:){2,7}[0-9a-fA-F]{1,4}\b|::(?:[0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{0,4}/g;
 
 export function keyContainsPii(key: string): boolean {
   const lower = key.toLowerCase();