fix(telemetry): silence ConfigError for missing DSN

[sentry]

This PR silences ConfigError in the CLI's error-reporting layer. Previously, ConfigErrors, primarily triggered by AI agents (like Codex) attempting to use sentry send-event without a DSN configured, were being reported to Sentry telemetry as issues.

Root Cause (CLI-28M): ConfigError indicates a user misconfiguration (no DSN provided via --dsn flag or SENTRY_DSN environment variable). This is an expected and handled error condition, not a bug in the CLI itself. However, it was not explicitly listed in the classifySilenced() function, leading to unnecessary noise in telemetry.

Solution:

1. Added ConfigError to the SilenceReason type.
2. Imported ConfigError into packages/cli/src/lib/error-reporting.ts.
3. Modified classifySilenced() to return 'config_error' when an instanceof ConfigError is encountered. This ensures these expected user-misconfiguration errors are no longer reported as Sentry issues, while still being tracked by the cli.error.silenced metric.
4. Updated the corresponding test in packages/cli/test/lib/error-reporting.test.ts to reflect this change, moving ConfigError from the 'does NOT silence' group to a dedicated test asserting it is now silenced as 'config_error'.

Fixes CLI-28M

_{This PR was automatically generated by Sentry. You can adjust this setting at any time.}

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Project	Deployment	Actions	Updated (UTC)
cli	Ready	Preview	Aug 15, 2026 10:49am