v0.0.4

Changelog

• 7a76448: chore(ci): add TruffleHog secret scan to the security workflow (@fallais)
• 6f09ce4: chore(release): sign release checksums with keyless cosign (@fallais)
• 8217233: feat: service metadata + TTFA, observers, recording, audio mixer/DTMF/noise, extensions, and provider modalities (@fallais)
• 1dd0ee1: fix(release): pin cosign to 2.4.x for classic .sig/.pem signing (@fallais)
• 791ef74: refactor: group metrics and tracing under telemetry/ (@fallais)