TECH-8802: chore: migrate from asdf to mise

[marvinmalkowski]

Summary

Jira: https://smartrent.atlassian.net/browse/TECH-8802

• Replaces .tool-versions (asdf) with mise.toml + mise.lock for reproducible tool management
• Enables paranoid mode with lockfile checksums for supply chain security
• No CI changes required — CircleCI uses hardcoded Docker image tags, not .tool-versions

Changes

• Added mise.toml with tool versions and settings
• Added mise.lock with platform-specific checksums (linux-x64, macos-arm64)
• Removed .tool-versions

Developer setup after merge

1. Install mise: brew install mise (requires >= 2026.4.8)
2. Activate: echo 'eval "$(mise activate zsh)"' >> ~/.zshrc && source ~/.zshrc
3. Run: mise trust mise.toml && mise install

Test plan

• Local mise install installs all tools
• mise lock regenerates an identical lockfile

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