fix(kirocrew): pin stable release to 0.6.0

[royosherove]

Summary

• Pin the KiroCrew pack to the published stable 0.6.0 artifact in the installer, manifest, and help output.
• Align the pack preflight, plan, and regression assertion with KiroCrew v0.6.0's Python >=3.12 requirement.

Compatibility check

• The official v0.6.0 release notes and install guide state that Python 3.12 is the runtime floor and that the installer provisions managed CPython 3.12 by default.
• The signed stable artifact manifest at cli/stable/0.6.0/cli-manifest.json resolves to version 0.6.0, python_requires: >=3.12, and the expected kirocrew-0.6.0-py3-none-any.whl.
• The existing Lowkey-managed gateway service integration remains compatible: it continues to set KIROCREW_PORT/KIROCREW_HOME and exposes the canonical kirocrew.service alias used by managed restarts.

Validation

• bash -n packs/kirocrew/install.sh
• bash packs/kirocrew/test.sh (76 passed)
• bash tests/test-sync-registry.sh (46 passed)
• git diff --check

Not a goal

• This PR does not change KiroCrew gateway behavior, service topology, or the selected release channel.

[royosherove]

Intent: Pin the Lowkey KiroCrew pack to the published stable KiroCrew 0.6.0 artifact and keep the pack’s Python preflight aligned with that release’s supported runtime.
Not a goal: Change KiroCrew gateway behavior, service topology, release channel selection, or unrelated Lowkey packs.

[chatgpt-codex-connector]

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[royosherove]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 8906287c25

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