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.

docs/turn-loop/claude-invocation.md

@@ -61,16 +61,15 @@ clearing it goes back to the local value →
 context-window size per-model. Resolution order (first
 match wins):
 
-1. `HIVE_CONTEXT_WINDOW_TOKENS_<KEY>` env var, where `KEY`
-   (lowercased) is a substring of the active model name. Injected
-   by the meta flake from `services.hyperhive.c0re.contextWindowTokens`
-   (host-level NixOS option, defaults: haiku=200k, sonnet=1M,
-   opus=1M). Override these for all agents at once without a
-   per-agent config change.
+1. The harness's per-family defaults, matched when the family name
+   is a case-insensitive substring of the active model name:
+   haiku=200k, sonnet=1M, opus=1M.
 2. `HIVE_CONTEXT_WINDOW_TOKENS` — single global override for any
-   model (useful in dev / test).
-3. Hard fallback: `200_000` (conservative; only reached outside
-   NixOS where the env vars aren't set).
+   other model (useful in dev / test).
+3. Hard fallback: `200_000`.
+
+Once a turn completes, the window the model reports
+(`modelUsage.*.contextWindow`) replaces this value.
 
 The effective window drives watermarks; the harness exposes it at
 runtime via `/api/state.context_window_tokens` so the UI can show a
@@ -256,14 +255,13 @@ needs to `chown` a bind mount), once at startup:
   `hive-agent/prompts/system.md` by `hive-agent`'s `prompt::render`:
   HTML-comment markers (`<!-- role:agent -->...<!-- /role:agent -->`,
   same for `role:manager`) gate the role-specific blocks; both flavors
-  share everything else. Five placeholders are then
+  share everything else. Four placeholders are then
   substituted: `{label}` (short agent name), `{qualified_label}`
-  (hive-qualified `name@domain` form), `{operator_pronouns}`,
+  (hive-qualified `name@domain` form),
   `{hive_identity}` (for example `` on hive `pr1ma` ``; empty when
   `HYPERHIVE_HIVE_NAME` is unset), and `{swarm_identity}` (same
-  shape for the swarm). Pronouns come from `HIVE_OPERATOR_PRONOUNS`
-  env (set by the meta flake from
-  `services.hyperhive.c0re.operatorPronouns`, default `she/her`).
+  shape for the swarm). The template itself names the operator's
+  pronouns (`she/her`); no option sets them.
   When you enable `services.hyperhive.agent.docs.enable`, `HIVE_DOCS_DIR` is present
   in the environment and `render()` appends a one-sentence pointer
   telling the agent where the docs live.