chore: update dependencies, including mise tools

[bougyman]

• chore: update ash and mint dependencies
• chore: update all remaining hex deps

[Copilot]

Copilot review overview

🟡 Changes recommended

Dependency setup, shell compatibility, repeated bootstrap behavior, and CI toolchain pins need correction.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 3

Open (3)

• CI runtime pins are inconsistent with local toolchain · New
• Bash-only pushd/popd breaks tasks under /bin/sh · New
• mix setup skips fetching CLI dependencies · New

What changed in this PR

Updates Hex dependencies and local development tooling for the Linear CLI.

Changes:

• Refreshes the application dependency lockfile.
• Updates mise tool versions and development tasks.
• Adds dependency setup to the Opus workspace workflow.

File	Changes
workflow.opus.yaml	Adds workspace dependency initialization.
mise.toml	Updates toolchain pins and development tasks.
app/​mix.lock	Records refreshed Hex dependencies.

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