The x_search toolset is gated on xAI credentials (SuperGrok OAuth or
XAI_API_KEY), but it was staying off-by-default even for users who had
already configured those credentials — they had to also click through
`hermes tools` → X (Twitter) Search to flip it on. The HASS_TOKEN →
homeassistant rule already handles the parallel case cleanly; x_search
needs the same treatment.
Why a separate code path from HASS_TOKEN: `ha_*` tools live inside
the `hermes-cli` composite, so the subset-inference loop picks them
up and the HASS branch just unmasks default_off. `x_search` is its
own one-tool toolset NOT in the composite, so the subset loop never
adds it — it has to be injected directly.
* Add `_xai_credentials_present()` — side-effect-free check for stored
xAI OAuth tokens or XAI_API_KEY (dotenv or env). No network.
* In `_get_platform_tools()` else branch (no explicit user config),
inject `x_search` and carve a parallel hole in default_off.
* Auto-enable does NOT fire when the user has saved an explicit toolset
list via `hermes tools` — that list stays authoritative.
* `agent.disabled_toolsets: [x_search]` still wins (global override).
Tests: 4 new in test_tools_config.py covering OAuth path, API-key path,
no-creds path, and explicit-config-respect. All pass alongside existing
70/70 in that file.
Teknium
ad1aa1a037