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/events.rs

@@ -367,10 +367,10 @@ pub struct Bus {
     /// Per-inference context-window size as reported by the Anthropic API
     /// in the stream-json `result` event (`modelUsage.*.contextWindow`).
     /// Set by the stdout pump on every completed turn. Takes precedence
-    /// over the Nix-configured `HIVE_CONTEXT_WINDOW_TOKENS_*` env vars
+    /// over the per-model defaults in `harness_state::context_window_tokens`
     /// for compaction watermark calculations — it reflects the actual
-    /// limit the model enforces, which may differ from what the operator
-    /// configured (e.g. 200 k active window on a 1 M cache-enabled model).
+    /// limit the model enforces, which may differ from the default
+    /// (e.g. 200 k active window on a 1 M cache-enabled model).
     api_context_window: Arc<Mutex<Option<u64>>>,
     /// Resolved model id from the most recent turn's `assistant` events
     /// (the API-echoed `message.model`, e.g. `claude-opus-4-8`), as