v7.5.0

## Asterisk AI Voice Agent v7.5.0

v7.5.0 improves narrowband call audio while preserving the established 8 kHz
Asterisk wire contract, and adds a production-oriented VICIdial Remote Agent
integration.

### Highlights

- **Opt-in enhanced telephony audio:** assign `telephony_enhanced_8k` to an
  Agent for stateful band-limited 16/24 kHz-to-8 kHz downsampling. Existing
  Agents retain their current profile; switch back to `telephony_ulaw_8k` for
  immediate rollback.
- **Provider and pipeline audio policy:** hosted providers and modular TTS
  pipelines inherit the selected per-call Audio Profile, with validated
  compatibility overrides.
- **Interruption and teardown hardening:** resampler, playback, barge-in,
  farewell, and cleanup state is isolated across calls and response boundaries.
- **VICIdial Remote Agents:** VICIdial remains authoritative for campaigns,
  customer channels, dispositions, DNC, callbacks, and transfers while AAVA
  supplies the mapped AI conversation.
- **Safer update recovery:** the pinned host recovery path covers mixed
  ownership, stale updater images, local tracked edits, and older Admin UI
  planner failures.

### Upgrade guidance

Read these before upgrading an existing installation:

- [v7.5.0 installation and upgrade guide](https://github.com/hkjarral/AVA-AI-Voice-Agent-for-Asterisk/blob/main/docs/INSTALLATION.md#upgrade-to-v750-existing-checkout)
- [v7.5.0 migration notes](https://github.com/hkjarral/AVA-AI-Voice-Agent-for-Asterisk/blob/main/docs/MIGRATION.md#v741-to-v750)
- [v7.5.0 validation matrix](https://github.com/hkjarral/AVA-AI-Voice-Agent-for-Asterisk/blob/main/docs/baselines/golden/v7.5.0-validation-matrix.md)
- [Complete changelog](https://github.com/hkjarral/AVA-AI-Voice-Agent-for-Asterisk/blob/main/CHANGELOG.md#750---2026-07-22)

The v7.5.0 source tag is immutable. Its bundled documentation predates the
post-release documentation correction, so use the linked `main` guides for the
current upgrade procedure.

### Agent CLI tools

Pre-built binaries for all supported CLI platforms are attached to this release.

**Linux AMD64 installation:**

```bash
curl -L -o agent https://github.com/hkjarral/AVA-AI-Voice-Agent-for-Asterisk/releases/download/v7.5.0/agent-linux-amd64
chmod +x agent
sudo mv agent /usr/local/bin/
agent version
```

Available binaries:

- `agent-linux-amd64`
- `agent-linux-arm64`
- `agent-darwin-amd64`
- `agent-darwin-arm64`
- `agent-windows-amd64.exe`

Verify downloads with the attached `SHA256SUMS` file.