-- context.lua — in-memory conversation history + token budget.
-- Phase 0: ordered turn list, sliding window eviction.
-- Tokenization is char/4 heuristic in Phase 0; accurate count is Phase 2.
-- See docs/PHASE0.md §8.

local M = {}

-- Construct a Context table from config.context.
function M.new(opts)
    error("context.new: not implemented (Phase 0 pending)")
end

-- Append a turn { role = ..., content = ... }.
function M:append(turn)
    error("context:append: not implemented (Phase 0 pending)")
end

-- Render messages array suitable for broker.chat (system prompt prepended).
function M:to_messages()
    error("context:to_messages: not implemented (Phase 0 pending)")
end

-- Apply max_turns eviction policy. Returns number of turns evicted.
function M:enforce_budget()
    error("context:enforce_budget: not implemented (Phase 0 pending)")
end

return M