chore: migrate rexec configuration to v0.2.0 schema 1

[chrisdpurcell]

Replaces the v0.1 overlay config with a self-contained schema-1 .rexec.toml reproducing this repository's full effective v0.1.3 configuration (fleet cutover of 2026-08-10; deltas recorded in remote-execution docs/evidence/rexec-v0.2/release-acceptance.md). Includes the earlier local rexec requirements commit that had not been pushed.

Summary by CodeRabbit

• Chores
  • Added configuration for remote execution, including the remote host and Go tool version.
  • Enabled a remote-cache-backed Python environment.
  • Defined the Debian packages required for environment provisioning.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5a870045-372d-404b-b386-20927116dda0

📥 Commits

Reviewing files that changed from the base of the PR and between ee6883c and e9b0d7e.

📒 Files selected for processing (1)

• .rexec.toml

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📝 Walkthrough

Walkthrough

The repository adds a schema-1 .rexec.toml configuration. It specifies the remote host, Go 1.26.5, a remote-cache-backed Python environment, and the Debian packages required for provisioning.

Changes

Remote execution

Layer / File(s)	Summary
Remote execution configuration .rexec.toml	Defines the remote host, Go tool version, {remote_cache} environment expansion, and ordered Debian provisioning packages.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the migration of the rexec configuration to the v0.2.0 schema-1 format.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/rexec-v0-2-config

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