fix(integrations): show hyphenated command names for docker-agent and junie

[Chaoqi31]

Description

docker-agent and junie both register hyphenated commands (/speckit-<name>), and their own build_command_invocation returns that form. Spec Kit still showed their users the dotted names (/speckit.<name>), which those agents never register:

• docker-agent installs .agents/skills/speckit-<name>/SKILL.md, the same layout as zed and muse, but it was missing from ALWAYS_SLASH_AGENTS. So is_slash_skills_agent("docker-agent", ...) returned False. The specify init next-steps banner listed /speckit.specify, /speckit.plan, and so on. Extension hooks rendered /speckit.git.commit. fix(alquimia): render /speckit-<name> invocations for the skills-only Alquimia agent #4137 fixed the same gap for alquimia by adding its key to the set. docker-agent has no non-skills mode, so it belongs with zed and muse in ALWAYS_SLASH_AGENTS.
• junie installs .junie/commands/speckit-<name>.md. Hook rendering already special-cases it, but the init banner only special-cased cline and forge. So specify init --integration junie listed /speckit.constitution, /speckit.plan, and so on.

A check over all registered integrations found no other mismatch between the banner, the hook rendering and build_command_invocation. Each change follows the existing pattern; the invocation-style mechanism itself is unchanged.

Testing

• New test_is_slash_skills_agent and test_hook_invocation_renders_the_hyphenated_form in test_integration_docker_agent.py, modelled on the alquimia tests. On main: assert False is True and assert '/speckit.git.commit' == '/speckit-git-commit'.
• New test_init_next_steps_show_hyphenated_commands in test_integration_junie.py. On main the banner contains /speckit.plan, not /speckit-plan.
• With the fix: the two changed test files pass (87 passed). tests/integrations, tests/test_extensions.py, tests/specify_cli/integrations and tests/specify_cli/extensions: 4597 passed, 5 skipped.
• CLI: specify init <dir> --integration <docker-agent|junie> --ignore-agent-tools --non-interactive now prints /speckit-plan (was /speckit.plan) for both. docker-agent's before_plan hook now prints /speckit-git-commit.

Equivalent local checks: tests ran with .venv/bin/python -m pytest and the CLI with the venv's specify, on macOS.

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (fill in the disclosure below)

AI disclosure: This contribution was produced by Claude Code running autonomously on behalf of @Chaoqi31. An audit agent (Claude Fable 5.1, max reasoning effort) found the docker-agent gap and wrote a failing reproduction. The orchestrating agent (Claude Opus 5) found the junie banner case. A fix agent (Claude Opus 5, xhigh effort) wrote the fix and tests. A separate review agent checked the branch, and the orchestrating agent wrote the commits and this description. AI generated the code, tests and text. No human reviewed the diff line by line before submission.