feat(runtime): survival-bot pivot — MC chat is dialog-only (Phase 0) (#12)

Phase 0 of plans/autonomous-survival-bot-prd.md: change the product
direction from operator-driven remote control to autonomous survival
resident. MC chat is dialog-only for everyone, including
OPERATOR_USERNAMES — commands like come/follow/build/pause/stop are
recorded in the diary but not dispatched. TUI remains the only local
control plane.

Runtime changes:
- Remove operatorGoalReflex from reflex.js (the come-here chat command).
- Replace handleOperatorChat in bot.js with a dialog-only handleChat
  that answers greetings/status questions and records command-like
  verbs (en+ru) without dispatching them.
- Default MC_VERSION to "auto" in runtime/config.js; mineflayer
  receives `false` to trigger version auto-detection.
- Update auto-escalation prompt's reflex chain summary.

Docs:
- AGENTS.md: product pivot notice up top; chat-driven scope-trust is
  flagged as legacy/Pi-only.
- README.md / docs/runtime.md: replace operator-chat command list with
  dialog-only description; update reflex chain summary.
- docs/roadmap.md: Phase 2/3 marked superseded by the PRD where they
  assumed chat-driven control.

Co-authored-by: Yuriy Mayatnikov <mayatnikov@me.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

runtime/config.js

@@ -22,11 +22,20 @@ const host = req("MC_HOST");
 const port = Number.parseInt(opt("MC_PORT", "25565"), 10);
 const username = req("MC_USERNAME");
 
+// MC_VERSION: "auto" (or empty) lets mineflayer auto-detect from the server
+// handshake — the right default per the survival-bot PRD (no hard-coded modern
+// version unless the server requires pinning). Mineflayer accepts `false` to
+// auto-detect, so we translate "auto" into false at the boundary; the original
+// string is preserved for logging.
+const rawVersion = opt("MC_VERSION", "auto");
+const mineflayerVersion = rawVersion.toLowerCase() === "auto" ? false : rawVersion;
+
 export const config = Object.freeze({
 	host,
 	port,
 	username,
-	version: opt("MC_VERSION", "1.21.5"),
+	version: rawVersion,
+	mineflayerVersion,
 	authMode: opt("MC_AUTH_MODE", "offline"),
 	authmePassword: opt("MC_AUTHME_PASSWORD", ""),
 	operators: opt("OPERATOR_USERNAMES", "")