Chore: remove deprecated hc-launch, bump hc-scaffold to 0.600.1

[pdaoust]

Do for main what #238 did for holochain-0.6.

Summary by CodeRabbit

• Chores
  • Removed hc-launch from development environment and build workflows across all configuration files and project templates
  • Updated hc-scaffold to version 0.600.1
  • Removed hc-launch from GitHub Actions build matrix and eliminated the dedicated automated version update job
  • Streamlined development environment setup and dependencies

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[cocogitto-bot]

✔️ c73ced5...f8a3b94 - Conventional commits check succeeded.

[coderabbitai]

Walkthrough

This pull request removes the hc-launch (Holochain Launch CLI) tool and its dependencies from across the entire codebase. Changes include removing hc-launch from GitHub Actions workflows, the flake.nix input declarations and all references (derivations, packages, apps, devShells, introspection), template files, and documentation. The hc-scaffold reference is also updated to v0.600.1.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflows .github/workflows/build.yaml, .github/workflows/command-listener.yaml, .github/workflows/holonix-update.yaml	Removed hc-launch from build matrix; removed entire bump_hc_launch job with all steps; removed update-launcher input and launcher bump step from holochain version update workflow
Root Configuration flake.nix	Removed hc-launch input, derivation, and all references across packages, apps, devShells, and introspection script; updated hc-scaffold URL ref from v0.600.0 to v0.600.1
Documentation README.md	Removed hc-launch, lair-keystore, hc-scaffold, and hn-introspect from dev shell package list
Template Files templates/custom-holochain/flake.nix, templates/custom-rust/flake.nix, templates/default/flake.nix	Removed hc-launch from devShell package lists in all three templates

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• flake.nix requires careful verification of input removal, derivation cleanup, and reference elimination across multiple sections (packages, apps, devShells, introspection)
• Confirm no orphaned references to hc-launch remain elsewhere in the flake
• Validate that hc-scaffold version bump (v0.600.0 → v0.600.1) is intentional and compatible

Possibly related PRs

• Chore: bump hc-launch and scaffolding to 0.600.0 #236: Updates hc-launch and hc-scaffold to v0.600.0; this PR removes hc-launch entirely and bumps hc-scaffold to v0.600.1
• chore: Update scaffolding for 0.6 #219: Modifies the hc-scaffold input ref in flake.nix; this PR also updates hc-scaffold along with removing hc-launch
• chore: update scaffolding to 0.600.0 #231: Updates the hc-scaffold URL/ref in flake.nix; overlaps with hc-scaffold version changes in this PR

Suggested reviewers

• matthme
• ThetaSinner
• veeso

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the two main changes: removal of deprecated hc-launch and bumping hc-scaffold to 0.600.1, which matches the raw summary and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/tooling-updates-for-main

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1c372eb and f8a3b94.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (8)

• .github/workflows/build.yaml (0 hunks)
• .github/workflows/command-listener.yaml (0 hunks)
• .github/workflows/holonix-update.yaml (0 hunks)
• README.md (0 hunks)
• flake.nix (1 hunks)
• templates/custom-holochain/flake.nix (0 hunks)
• templates/custom-rust/flake.nix (0 hunks)
• templates/default/flake.nix (0 hunks)

💤 Files with no reviewable changes (7)

• templates/custom-holochain/flake.nix
• .github/workflows/build.yaml
• templates/custom-rust/flake.nix
• .github/workflows/holonix-update.yaml
• templates/default/flake.nix
• .github/workflows/command-listener.yaml
• README.md

🔇 Additional comments (2)

flake.nix (2)

350-396: Clean removal of hc-launch from all exports.

The packages, apps, and devShells sections are consistent—hc-launch has been fully removed from all export surfaces. The remaining tools (holochain, hc, hcterm, bootstrap-srv, lair-keystore, hc-scaffold, hn-introspect, hc-playground, rust) are properly wired.

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40-44: Version bump to v0.600.1 is correct.

The hc-scaffold input is properly updated to reference the existing v0.600.1 tag in the holochain/scaffolding repository.

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