fix: raise the TypeScript servers' Node floor to 24

[cliffhall]

Closes #5168

Raises the TypeScript servers' Node floor from 20 to 24. The v2.0.0 release ledger found that the documented floor and the published floor disagreed:

• All four packages declared engines: >=20, and their READMEs and 2.0.0 CHANGELOG entries said "Node.js 20 or later".
• CI never ran Node 20, and AGENTS.md and docs/quality-gate.md named 22 as the oldest supported version.
• Node 20 is end of life, and 22 reaches end of life in April 2027.

Changes

• Packages:
  • engines.node is >=24 in everything, filesystem, memory and sequentialthinking.
  • @types/node goes ^22 → ^24 in the three workspaces that declare it, so the types match the floor.
  • package-lock.json is updated to match.
• README and CHANGELOG:
  • The "Requirements" line now reads "Node.js 24 or later".
  • The 2.0.0 CHANGELOG entry's "requires Node.js 20 or later" becomes 24.
  • There is no changeset, and the version stays 2.0.0. 2.0.0 is not on npm yet, so the entry is corrected in place. A changeset would bump the first v2 release to 2.0.1 (or 3.0.0) and announce a floor change against a version nobody ever installed.
• CI:
  • The validate matrix in typescript.yml is [24, 26] (it was [22, 24, 26]).
  • Every workflow's node-version: 22 is now 24, including the release.yml build jobs.
  • The publish job keeps its exact 24.21.0 pin. Only its comment changed.
• Docs: AGENTS.md Development setup, docs/quality-gate.md (prose and the stage table) and the local-dev skill now name 24 as both the development version and the floor.

How Has This Been Tested?

This change has no client-visible surface; it changes metadata, docs and CI. Targeted probes:

• npm run local:gate on Node 24.20.0 (the new floor line): EXIT=0.
• grep over the tree for >=20, Node.js 20, Node 22, 22, 24 and node-version: 22, excluding node_modules and the lockfile: no hits.
• The lockfile diff touches only the four engines entries, the three @types/node ranges, and @types/node 22.19.21 → 24.19.2 with its undici-types.
• The CI matrix change is exercised by this PR's own Validate … (Node 24/26) legs.

Checklist

• Read the MCP documentation for the feature touched: not applicable (no protocol change).
• Follows MCP security best practices: not applicable.
• Server READMEs updated (the Requirements line).
• Tested with an LLM client: not applicable. The change has no client-visible surface; the gate and CI legs are the evidence.

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1ad67f5

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[github-actions]

everything: MCP interface diff

Base: bbcc15b3639d (Merge pull request #5165 from modelcontextprotocol/v2/chore/5159-python-calver-2026.10.18)
Head: the build in this checkout, at 18d7017f82c7 (Merge 1ad67f5 into bbcc15b)

✅ No interface changes detected.

	Tools	Prompts	Resources	Resource templates
Base	22	4	7	3
Head	22	4	7	3

_{Updated by this run for 1ad67f50a3eccfe7b975e136740bf143a6c46c33.}

[Copilot]

🟢 Approval recommended

The scoped metadata, documentation, and workflow changes consistently implement the requested Node 24 floor, with no unresolved findings.

No open issues 🎉

What changed in this PR

Aligns the four TypeScript reference servers’ Node.js requirement with development and CI before the unpublished 2.0.0 release, addressing #5168.

Changes:

• Raises package engines to Node 24 and aligns Node types and lockfile metadata.
• Updates workflows to Node 24, retaining validation on Node 26 and the exact publishing runtime pin.
• Corrects requirements and unreleased changelogs without changing package versions.

File	Description
src/​sequentialthinking/​README.md	Documents Node 24 requirement.
src/​sequentialthinking/​package.json	Raises engines and Node types.
src/​sequentialthinking/​CHANGELOG.md	Corrects unreleased Node requirement.
src/​memory/​README.md	Documents Node 24 requirement.
src/​memory/​package.json	Raises engines and Node types.
src/​memory/​CHANGELOG.md	Corrects unreleased Node requirement.
src/​filesystem/​README.md	Documents Node 24 requirement.
src/​filesystem/​package.json	Raises engines and Node types.
src/​filesystem/​CHANGELOG.md	Corrects unreleased Node requirement.
src/​everything/​README.md	Documents Node 24 requirement.
src/​everything/​package.json	Raises Node engine requirement.
src/​everything/​CHANGELOG.md	Corrects unreleased Node requirement.
package-lock.json	Aligns engines and type dependencies.
docs/​quality-gate.md	Updates supported runtime and CI documentation.
AGENTS.md	Aligns development and minimum Node versions.
.github/​workflows/​version-packages.yml	Runs versioning on Node 24.
.github/​workflows/​typescript.yml	Validates Node 24/26; updates supporting jobs.
.github/​workflows/​sdk-watch.yml	Runs dependency sweep on Node 24.
.github/​workflows/​release.yml	Updates build runtimes; clarifies unchanged publishing pin.
.github/​workflows/​python.yml	Runs Node-based helpers on Node 24.
.github/​workflows/​prepare-python-release.yml	Runs release preparation on Node 24.
.github/​workflows/​main-source.yml	Runs source guard on Node 24.
.github/​workflows/​everything-mcp-diff.yml	Runs interface comparison on Node 24.
.github/​workflows/​dependency-refresh.yml	Runs dependency refresh on Node 24.
.github/​workflows/​dependabot-alerts.yml	Runs alert sweep on Node 24.
.github/​workflows/​dco.yml	Runs signoff check on Node 24.
.claude/​skills/​local-dev/​SKILL.md	Updates local runtime guidance.

_{Review effort: Balanced}

[cliffhall]

Copilot round 1: clean, no findings. Review loop stopped on the first clean round.