refactor(audit): address review comments on the audit consumer

[pfreixes]

Follow-ups to review comments on #6954, which merged before they were addressed.

• Drops a sort comparator and the comment defending it. Both guarded against a locale difference that cannot arise between pods running one image. Neither was needed either: the comparator only existed to satisfy a type-aware lint rule, and that rule had already stopped firing once the array was narrowed from (string | undefined)[] to string[] by a separate change.
• Renames describe to nonIdentifyingFields. Its comment stated which fields may be read out of the audit blob — a constraint on the caller, not a description of what the function does. The name carries it instead. The token comment is trimmed to the part the code does not already say.
• Removes the env test that only asserted zod rejects a fractional value. It exercised the library rather than any logic of ours.

No behaviour change: the same fields are logged, and the dedup token is byte-identical because Array.prototype.sort on a string array already compares UTF-16 code units.

Test plan

• npm run ts-build clean
• Unit: metering 6, utils 350, audit 25
• Verified the token-stability test still fails if the sort is removed, so dropping the comparator did not weaken the guard
• prettier + oxlint clean

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}