fix: align checklist guidance with docs

[meow2149]

Description

Aligns the specify init next-steps guidance with the Quick Start docs by describing /speckit.checklist as a requirements-quality gate to run before /speckit.plan, not after it.

Fixes #2606

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

Additional validation:

• uv run pytest tests/integrations/test_integration_copilot.py::TestCopilotSkillsMode::test_init_skills_next_steps_show_skill_syntax -q
• git diff --check
• uv run specify init <tmp>/checklist-order --integration copilot --integration-options "--skills" --no-git and verified the output says before /speckit-plan and not after /speckit-plan

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

This PR was prepared with Cursor AI assistance. I reviewed the issue, compared the CLI guidance with the Quick Start docs, made the minimal text change, and added a focused regression assertion.

Made with Cursor

[Copilot]

Pull request overview

Aligns the specify init “Enhancement” guidance with the Quick Start docs by clarifying that /speckit-checklist is intended to be run before /speckit-plan (as a requirements-quality gate), and adds a focused regression assertion for Copilot skills mode output.

Changes:

• Update specify init checklist description from “after plan” to “before plan”.
• Add a test assertion ensuring Copilot skills-mode next-steps output contains “before /speckit-plan” and does not contain “after /speckit-plan”.

Show a summary per file

File	Description
src/specify_cli/commands/init.py	Updates the printed “checklist” next-steps guidance to indicate it should be run before planning.
tests/integrations/test_integration_copilot.py	Adds a regression assertion for the corrected checklist guidance in Copilot skills mode output.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0