[ryota-murakami]

Summary

Moves the project's Node pin to 26.12.1 (.node-version and package.yml). The commit is the owner's, taken unchanged from the Cycle 0058 branch, where it was split off so that Cycle 0058 (PR #144) merges on the verified Node 24.21.0 (owner decision, Refs #143).

What this needs before it can merge

CI on Node 26.12.1 is expected to fail until this work is done here:

• Health baseline: pnpm --dir extension health refuses because extension/fallow-health-reference.json pins Node 24.21.0 and the old .node-version hash. AGENTS.md: retake the measured baseline from 944c1342 in a separate worktree with the new pins, record the hashes in the reference (health.test.mjs pins it), and say so in this PR.
• Tests that fail on Node 26.12.1 (they pass on 24.21.0, seen on the Cycle 0058 branch's CI and locally):
  • fakeClock.test.js: "a wait spends no fake time while a real file read is pending", "advancing the fake clock spends no fake time while a real file read is pending"
  • claimWikiUpdateMarker.test.js: "links beside the marker that the system refuses to unlink are left in place when they are older than 60 s …"
  • isFolderOfItsOwn / folder listing (CI shard 9): "a folder of its own is listed with everything below it, and a link below it is named and not entered"
• Recheck every other pin that names Node 24 (for example the inspector-line and runner-output tests that mention Node 24.21).

Test plan

• Root cause of each Node 26 failure fixed in the product or the test, red first
• Health baseline retaken with the new pins; pnpm --dir extension health exit 0
• Required CI green on Node 26.12.1

🤖 Generated with Claude Code

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