fix(nix): align devShell to Node 22 LTS

[Jesssullivan]

Summary

• Dev shell pinned to Node 20, now Node 22 LTS
• Aligns with acuity-middleware (Node 22) and MassageIthaca (requires >=22)
• CI already tests both Node 20 and 22 — this only changes the local dev shell default

Tracked

• TIN-101 (toolchain convergence — align Nix devShells with CI toolchains)

[greptile-apps]

Greptile Summary

Upgrades the Nix dev shell from Node 20 to Node 22 LTS by swapping nodejs_20 for nodejs_22 in flake.nix. This aligns the local development environment with CI (which already tests Node 22) and with sibling projects that require >=22.

Confidence Score: 5/5

Safe to merge — single-attribute swap with no logic, security, or compatibility concerns.

The change is a one-line attribute rename from nodejs_20 to nodejs_22 in the Nix dev shell. It introduces no new logic, no security surface, and aligns with an already-tested CI matrix. No issues found.

No files require special attention.

Important Files Changed

Filename	Overview
flake.nix	Bumps dev shell Node.js from nodejs_20 to nodejs_22; single-line attribute swap, no other changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Developer runs nix develop] --> B[flake.nix evaluated]
    B --> C{Node.js version}
    C -->|Before PR| D[nodejs_20 — Node 20 LTS]
    C -->|After PR| E[nodejs_22 — Node 22 LTS]
    E --> F[Matches CI matrix & sibling project requirements]
    D --> G[Misaligned with CI and sibling projects]

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_{Reviews (1): Last reviewed commit: "fix(nix): align devShell to Node 22 LTS" | Re-trigger Greptile}