Refactor default safety values tip into an includable file

[Copilot]

Overview

This PR refactors the "Default Safety Values" tip from docs/howto/bootstrap/collect.md into a reusable includable file, following the same pattern established in PR #1010 for other decision point tips.

Changes

Created

• docs/_includes/default_safety_values.md - New includable file containing the "Default Safety Values" tip that recommends assuming a marginal Safety Impact when no information is available about the device's environment.

Modified

• docs/howto/bootstrap/collect.md - Replaced the inline tip with {% include-markdown "../../_includes/default_safety_values.md" %} to reference the new includable file.

• docs/reference/decision_points/safety_impact.md - Added the include in two strategic locations:

  • After the "See also" tip block, making the default value recommendation visible on the main Safety Impact reference page
  • At the beginning of the "Gathering Information About Safety Impact" section, providing guidance where it's most relevant for users gathering information about this decision point

Benefits

• DRY Principle: The tip content is now defined once and reused in multiple places, making maintenance easier
• Consistency: Users see the same default value recommendation whether they're reading the data collection guide, the reference documentation, or the gathering information section
• Maintainability: Future updates to the default safety values guidance only need to be made in one place

Related Issues

Closes #[issue number] (child of #522)

Pattern Consistency

This refactoring follows the established pattern for includable tips, consistent with:

• _includes/automatable_cvss_ssvc.md
• _includes/value_density_cvss_ssvc.md
• _includes/safety_cvss_ssvc.md

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Refactor default safety values in collect.md into an includable</issue_title>
<issue_description>Child of #522

• Refactor the Default Safety Values tip from docs/howto/bootstrap/collect.md into an includable file in docs/_includes
• Replace the tip in collect.md with the included tip
• Include the tip to the decision point reference page docs/reference/decision_points/safety_impact.md
• Include the tip in the "gathering info" page for safety
  </issue_description>

<agent_instructions>This is very similar to the changes in PR #1010, follow those as an example.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #963

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