fix(integration): clarify multi-install guidance

[PascalThuet]

Summary

Follow-up to #2498 and #2519.

Clarifies specify integration install guidance when the requested integration is already installed or when installing alongside existing integrations requires an explicit unsafe multi-install opt-in.

Changes

• Replace the already-installed uninstall first suggestion with non-destructive use / upgrade guidance.
• Make unsafe multi-install guidance distinguish replacement from coexistence:
  • specify integration switch <key> to replace the default integration.
  • specify integration install <key> --force to install alongside existing integrations anyway.
• Add tests for default and non-default already-installed integrations, plus unsafe multi-install message content.

Notes

This only changes CLI guidance text and tests. It does not change install, switch, or multi-install behavior.

Validation

Local:

• uv run pytest tests/integrations/test_integration_subcommand.py -v
• git diff --check origin/main

CI:

• Full pytest, ruff, and markdownlint coverage runs via GitHub Actions on the PR.

AI Disclosure

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

Used AI assistance to inspect the existing integration install flow, implement the scoped guidance update, add tests, and run local validation. The changes were reviewed before submission.

[Copilot]

Pull request overview

Clarifies CLI guidance for specify integration install when an integration is already installed or when unsafe multi-install requires an explicit opt-in.

Changes:

• Updates already-installed messaging to suggest use or upgrade instead of uninstalling.
• Separates replacement guidance from coexistence guidance for unsafe multi-install errors.
• Adds/updates integration subcommand tests to cover the new guidance text.

Show a summary per file

File	Description
src/specify_cli/__init__.py	Refines integration install guidance messages without changing behavior.
tests/integrations/test_integration_subcommand.py	Adds assertions for default/non-default already-installed cases and unsafe multi-install guidance.

Copilot's findings

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• Files reviewed: 2/2 changed files
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