Greptile Summary

This PR makes a targeted, correct fix to OpenAITTSProvider by replacing || with ?? (nullish coalescing) when defaulting config.speed to 1.0. This prevents a falsy numeric value like 0 from incorrectly triggering the fallback — consistent with how numeric configuration values should be handled.

• The fix is logically sound: ?? defaults only on null/undefined, while || would have silently overridden an explicit speed: 0 (which, while outside the valid 0.25–4.0 range, should produce an API error rather than a silent override).
• The remaining uses of || for model and voice (lines 82–84) are appropriate since those are string fields where an empty string is also a valid "not set" signal.
• There is no range validation guard for speed (i.e., enforcing [0.25, 4.0]), but this is a pre-existing gap unrelated to this PR. Consider adding a guard in a follow-up to surface misconfiguration earlier than an API error.

Confidence Score: 5/5

• This PR is safe to merge — the one-line change is correct, well-scoped, and introduces no regressions.
• The fix is a straightforward and correct improvement to a single config default assignment. The ?? operator is semantically appropriate for numeric optional fields. No tests or interfaces are changed, and the rest of the file is unaffected.
• No files require special attention.

_{Last reviewed commit: e7192e4}

Both CI failures are pre-existing and unrelated to this change:

• CI / check: formatting issue in src/discord/monitor/exec-approvals.test.ts — not in this diff
• CI / secrets: false positives in test files (systemd.test.ts, connection-auth.test.ts, runner.ts) — none touched by this PR

Diff is a single line in extensions/voice-call/src/providers/tts-openai.ts. Happy to address in a follow-up if helpful, but keeping this PR scoped to the single fix.

After rebasing onto upstream main, I can see this fix (?? instead of || for config.speed) is already present in the current main. Happy to close this if it's been addressed — or let me know if you'd still like to merge it.