fix(graphile-llm): bump graphile-search peer to ^2; document Node 22 floor

[pyramation]

Summary

Fixes the peer-dependency conflict a fresh npm install pgpm@5.30.5 reports:

npm warn Conflicting peer dependency: postgraphile@5.0.3
npm warn   peer postgraphile@"5.0.3" from graphile-search@1.21.6
npm warn     peerOptional graphile-search@"^1.18.0" from graphile-llm@1.15.8

Root cause: graphile-llm still declared peerDependencies["graphile-search"] = "^1.18.0" while the workspace (and graphile-settings) ship graphile-search@2.14.6. npm satisfies the stale optional peer by hoisting the last 1.x (1.21.6, which pins exact peers postgraphile@5.0.3, graphile-build@5.0.2, …) next to the 2.14.6 the rest of the tree uses — an extraneous second copy with peers a minor behind. graphile-llm is already built and tested against the workspace 2.x via its devDependencies, so the pin was simply never bumped.

- "graphile-search": "^1.18.0",
+ "graphile-search": "^2.0.0",

Only stale internal peer in the repo (checked every peerDependencies entry naming a workspace package against that package's current version).

Also: constructive-monorepo-setup skill said "Node.js 20+"; the root engines and postgraphile/grafast/@dataplan/pg all declare node >=22 (and grafast needs Promise.withResolvers), so the skill now says 22+. Companion doc fixes: constructive.io prerequisites page and constructive-platform README.

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Open in Devin Desktop: https://app.devin.ai/desktop/session/6d533da4fa5a48399ad2c7508dffa32b?variant=devin
Requested by: @pyramation

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[tenki-reviewer]

Review complete. No issues found — approved ✅.

---

This PR makes two small, coherent changes: it raises the graphile-search peerDependency from ^1.18.0 to ^2.0.0 in graphile/graphile-llm/package.json, and it updates the constructive-monorepo-setup skill to require Node.js 22+ instead of 20+. The peer bump aligns with the already-published graphile-search 2.x line and the imports in the package's tests, and the Node floor is a documentation-only change with no code impact. No contradictory constraints or version disagreements were found.

Files	Change
graphile/graphile-llm/package.json	Raises the graphile-search peerDependency to ^2.0.0, aligning the manifest with the 2.x API the package already uses.
.agents/skills/constructive-monorepo-setup/SKILL.md	Updates the documented Node.js requirement from 20+ to 22+.

_{Reviewed commit: 8bd86ea}