remove c0re.operatorPronouns and c0re.contextWindowTokens

Both options are now ignored with a warning (the swarm-peers-removed.nix
shape), so a host that still sets one keeps evaluating.

- operatorPronouns: the agents' system prompt names the pronouns as
  she/her, the value the harness fell back to and the option's default.
  The --operator-pronouns flag, HiveEnv field, meta-flake let binding
  and HIVE_OPERATOR_PRONOUNS env var are gone.
- contextWindowTokens: the per-family defaults (haiku 200000, sonnet
  1000000, opus 1000000) move into hive-agent's harness_state as a
  table; the window the API reports after a turn still wins. The
  --context-window-tokens flag, HiveEnv field and the rendered
  HIVE_CONTEXT_WINDOW_TOKENS_<KEY> env vars are gone.

hive-agent/src/turn.rs

@@ -264,8 +264,8 @@ pub fn stall_sleep_secs() -> u64 {
 /// Resolve the effective context-window size for watermark calculations.
 /// Priority order (first wins):
 /// 1. API-reported window from the last `result` event's `modelUsage.*.contextWindow`.
-/// 2. `HIVE_CONTEXT_WINDOW_TOKENS_*` env vars (Nix-configured per-model defaults).
-/// 3. Hard fallback: 200 000.
+/// 2. `harness_state::context_window_tokens` (per-model defaults, then the
+///    `HIVE_CONTEXT_WINDOW_TOKENS` override, then 200 000).
 ///
 /// The API-reported window is the authoritative per-inference active
 /// context limit. It reflects what the model actually enforces — which