docs(telemetry): add legal documents and user-facing telemetry documentation

docs/reference/cli.md

@@ -42,6 +42,7 @@ bunx oh-my-opencode install
 2. **Plugin Registration**: Registers `oh-my-openagent` in OpenCode settings, or upgrades a legacy `oh-my-opencode` entry during the compatibility window
 3. **Configuration File Creation**: Writes the generated OmO config to `oh-my-opencode.json` in the active OpenCode config directory
 4. **Authentication Hints**: Shows the `opencode auth login` steps for the providers you selected, unless `--skip-auth` is set
+5. **Telemetry Defaults**: Anonymous telemetry remains enabled unless you opt out through environment variables
 
 ### Options
 
@@ -58,6 +59,8 @@ bunx oh-my-opencode install
 | `--opencode-go <no\|yes>` | OpenCode Go subscription |
 | `--skip-auth` | Skip authentication setup hints |
 
+Anonymous telemetry uses PostHog with a hashed installation identifier. Disable it with `OMO_SEND_ANONYMOUS_TELEMETRY=0` or `OMO_DISABLE_POSTHOG=1`. See [Privacy Policy](../legal/privacy-policy.md).
+
 ---
 
 ## doctor

docs/reference/configuration.md

@@ -973,6 +973,10 @@ When enabled, two companion hooks are active: `hashline-read-enhancer` (annotate
 | Variable              | Description                                                       |
 | --------------------- | ----------------------------------------------------------------- |
 | `OPENCODE_CONFIG_DIR` | Override OpenCode config directory (useful for profile isolation) |
+| `OMO_SEND_ANONYMOUS_TELEMETRY` | Set to `0`, `false`, or `no` to disable anonymous telemetry |
+| `OMO_DISABLE_POSTHOG` | Legacy telemetry opt-out flag. Set to `1` or `true` to disable PostHog |
+| `POSTHOG_API_KEY` | Optional override for the built-in PostHog project API key |
+| `POSTHOG_HOST` | Override the PostHog ingestion host. Defaults to `https://us.i.posthog.com` |
 
 ### Provider-Specific