ThermalVent

Extends Site (shared members and the pre-survey snapshot rule there). Any Site-returning API where kind() == "thermal", e.g. thermal_cap.vent().

Detail is gated by survey tier: basic reveals phase, wide adds steam rates, deep adds cycle timing.

Method	Returns	Needs	Meaning
`.survey_level()`	string or `None`	any survey	Highest tier achieved: `"basic"` / `"wide"` / `"deep"`. Reads live; a deeper re-survey upgrades held objects
`.current_phase()`	string or `None`	basic	`"active"` or `"dormant"`, live
`.base_steam_rate()`	number or `None`	wide	Peak steam t/h during active phase
`.current_steam_rate()`	number or `None`	wide	Steam t/h right now (0 dormant), live
`.cycle_active_minutes()` / `.cycle_dormant_minutes()`	number or `None`	deep	Phase durations
`.next_phase_in()`	number or `None`	deep	Game-minutes until the next flip; poll to act before dormancy
`.has_cap()` / `.cap_id()`	boolean / string	live	Whether a Thermal Cap is deployed, and its machine id (empty when none)

See also