chore: add mise.toml for runtime version management

[thedavidweng]

No description provided.

[greptile-apps]

Greptile Summary

This PR introduces mise.toml for runtime version management, pinning Go to 1.26.4 to match the version already declared in go.mod, and updates CONTRIBUTING.md to include mise install in the setup steps.

• mise.toml: New file with a single [tools] entry that pins Go to 1.26.4, ensuring every developer and CI run uses the same toolchain version as the module definition.
• CONTRIBUTING.md: Adds mise install before go mod download in the setup snippet so contributors know to run it; the Prerequisites note already references go.mod for the exact version.

Confidence Score: 5/5

Safe to merge — adds only a toolchain config file and a one-line doc update with no runtime impact.

The change is purely additive: a new mise.toml that mirrors the Go version already declared in go.mod, and a matching documentation update. No logic, no data paths, and no existing behaviour is modified.

No files require special attention.

Important Files Changed

Filename	Overview
mise.toml	New file pinning Go to 1.26.4, matching go.mod exactly — clean and reproducible.
CONTRIBUTING.md	Adds mise install step to the setup instructions, keeping the contributor workflow in sync with the new mise.toml.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Developer clones repo] --> B[mise install]
    B --> C{mise.toml resolves go = 1.26.4}
    C --> D[Go 1.26.4 toolchain installed]
    D --> E[go mod download]
    E --> F[Build / Test / Contribute]

    G[go.mod: go 1.26.4] -.->|version must match| C

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[Developer clones repo] --> B[mise install]
    B --> C{mise.toml resolves go = 1.26.4}
    C --> D[Go 1.26.4 toolchain installed]
    D --> E[go mod download]
    E --> F[Build / Test / Contribute]

    G[go.mod: go 1.26.4] -.->|version must match| C

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_{Reviews (3): Last reviewed commit: "docs: add mise to contributing guide" | Re-trigger Greptile}