fix: add Node LTS-only engine constraints to block odd-version installs

Installing @openrig/cli under Node 25 (homebrew default) silently
succeeds at npm but the daemon fails at runtime because
better-sqlite3 native prebuilds only ship for even-numbered LTS
lines (20, 22, 24). No engines field existed in packages/cli or
packages/daemon package.json to warn on install; README said
"Node.js 20+" with no upper bound.

Added engines.node "^20 || ^22 || ^24" to:
- packages/cli/package.json (published to npm; npm warns on
  mismatch when engine-strict or --engine-strict is set)
- packages/daemon/package.json (private; consistency)
- package.json (monorepo root; local dev)

Updated README Requirements to name supported LTS versions
explicitly and explain why odd releases are unsupported.

Added scripts/check-engines.test.mjs (runs under npm run
test:repo) to verify all three package.json files carry the
LTS-only constraint, preventing silent drift back to ">=20".

Postinstall ABI check deferred to separate scope (would require
VM gate for install-time validation under multiple Node versions).

Gates: check-engines 3/3; daemon 1792/1792; tsc + build clean.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -103,7 +103,7 @@ Hono HTTP daemon
 - **CLI**: 40+ commands designed for both humans and agents. Every mutating command ends with what happened, current state, and next action.
 - **UI**: Explorer sidebar, topology graph with pod grouping, node detail panel, system log, chatroom.
 - **MCP**: 17 tools so agents can manage their own topology (`rig_up`, `rig_ps`, `rig_send`, `rig_chatroom_send`, etc.)
-- **Runtimes**: Claude Code, Codex, and terminal nodes. Adapters for Pi and OpenHands in development.
+- **Runtimes**: Claude Code, Codex, and terminal nodes. Adapters for Pi and OpenCode in development.
 
 ## Key Concepts
 
@@ -129,7 +129,7 @@ Requires Docker for service-backed rigs.
 
 ## Requirements
 
-- Node.js 20+
+- Node.js 20, 22, or 24 (even-numbered LTS releases; odd releases like 25 lack native addon prebuilds)
 - tmux
 
 Optional:

package.json

@@ -18,6 +18,6 @@
     "build:package": "bash scripts/build-package.sh"
   },
   "engines": {
-    "node": ">=20"
+    "node": "^20 || ^22 || ^24"
   }
 }

packages/cli/package.json

@@ -55,5 +55,8 @@
     "@types/node": "^22.0.0",
     "typescript": "^5.7.0",
     "vitest": "^3.0.0"
+  },
+  "engines": {
+    "node": "^20 || ^22 || ^24"
   }
 }

packages/daemon/package.json

@@ -25,5 +25,8 @@
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
     "vitest": "^3.0.0"
+  },
+  "engines": {
+    "node": "^20 || ^22 || ^24"
   }
 }

scripts/check-engines.test.mjs

@@ -0,0 +1,24 @@
+import { readFileSync } from "node:fs";
+import { test } from "node:test";
+import assert from "node:assert/strict";
+
+const EXPECTED_ENGINE = "^20 || ^22 || ^24";
+
+const PACKAGE_PATHS = [
+  "package.json",
+  "packages/cli/package.json",
+  "packages/daemon/package.json",
+];
+
+for (const pkgPath of PACKAGE_PATHS) {
+  test(`${pkgPath} has engines.node set to LTS-only constraint`, () => {
+    const pkg = JSON.parse(readFileSync(pkgPath, "utf-8"));
+    assert.ok(pkg.engines, `${pkgPath} is missing an "engines" field`);
+    assert.ok(pkg.engines.node, `${pkgPath} is missing "engines.node"`);
+    assert.equal(
+      pkg.engines.node,
+      EXPECTED_ENGINE,
+      `${pkgPath} engines.node should be "${EXPECTED_ENGINE}" (even-numbered LTS only) but got "${pkg.engines.node}"`
+    );
+  });
+}