docs: update Node version references to 22.22 toolchain

[thephez]

Point the dev container image, install prerequisites, and CLAUDE.md toolchain guidance at the repo-pinned Node 22.22.x instead of the prior Node 20 references.

Summary by CodeRabbit

• Documentation

  • Updated Node.js minimum requirement from v20 to v22.22+ across all setup guides and prerequisites
  • Enhanced contributor documentation with Node/npm toolchain best practices and guidance

• Chores

  • Updated development container base image to Node.js v22

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ef24998c-8046-4709-89ed-cdfb681a8692

📥 Commits

Reviewing files that changed from the base of the PR and between 0461c70 and 143e567.

📒 Files selected for processing (4)

• .devcontainer/devcontainer.json
• CLAUDE.md
• README.md
• example-apps/dashnote/README.md

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📝 Walkthrough

Walkthrough

Upgrades the Node.js version from 20 to 22.22 across the repository: updates the Dev Container base image tag, revises prerequisite version strings in two READMEs, and extends CLAUDE.md with an nvm use step and a new "Node / npm Toolchain" section for contributors.

Changes

Node.js v20 → v22.22 Upgrade

Layer / File(s)	Summary
Dev Container image bump .devcontainer/devcontainer.json	Base image updated from javascript-node:20 to javascript-node:22.
Prerequisite docs and contributor toolchain guidance README.md, example-apps/dashnote/README.md, CLAUDE.md	Minimum Node.js version changed from v20+/>=20 to v22.22+ in both READMEs; CLAUDE.md gains an explicit nvm use step in the commands snippet and a new "Node / npm Toolchain" section covering .nvmrc usage, npm ci under nvm use, per-package engines.node, and lockfile/resolution notes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 Hippity hop, Node twenty's old hat,
Twenty-two-twenty-two, now fancy that!
.nvmrc guides the warren with care,
nvm use springs us right into the air.
New versions bloom like clover in spring! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: updating Node version references from 20 to 22.22 across documentation and configuration files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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