docs(agents): update RAI planner phase reference to consolidated rai-plan.md output

[Tas Devani (tasdevani21)]

Pull Request

Description

Refresh docs/agents/rai-planning/phase-reference.md to reflect the phase-file consolidation completed in PR #2568, which merged the eight per-phase artifacts into a single rai-plan.md with named sections.

Changes across the whole file:

• Phase Summary table: replace per-phase filenames in the "Key output" column with the corresponding rai-plan.md sections and subsections.
• Phase 1-6 Outputs sections: point every bullet to a rai-plan.md section anchor while preserving the descriptive content.
• Phase 2-6 Inputs sections: update references to prior-phase artifacts (for example, "System definition pack from Phase 1" → "rai-plan.md ## System Definition section from Phase 1") so the doc is internally consistent with the updated Outputs. This is slightly beyond the strict scope of the issue but leaving Inputs stale would contradict the Outputs on the same page.
• Phase 5 footer prose: reference the Control Surface Catalog, Evidence Register, and Tradeoffs sections instead of the standalone artifact names.
• Bump ms.date.

Verified against .github/agents/rai-planning/rai-planner.agent.md (Artifacts lines per phase) to make sure every section name and subsection matches the current output contract.

Related Issue(s)

Fixes #2569

Type of Change

Code & Documentation:

• Documentation update

Testing

Verified section names against ground truth:

• .github/agents/rai-planning/rai-planner.agent.md Artifacts lines for each phase (## System Definition, ## Stakeholder Impact, ### Risk Classification Screening, ## Standards Mapping, ## Threat Addendum, ## Control Surface Catalog, ## Evidence Register, ## Tradeoffs, ## Review Summary).
• Grepped the file for the old standalone filenames and the pre-consolidation conceptual names to confirm none remain.

Checklist

Required Checks

• Documentation is updated (if applicable)
• Files follow existing naming conventions
• Changes are backwards compatible (if applicable)

Required Local Checks

• Spell checking: npm run spell-check
• Link validation: npm run lint:md-links

Security Considerations

• This PR does not contain any sensitive or NDA information

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.10%. Comparing base (197afb8) to head (ff420e8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2590      +/-   ##
==========================================
- Coverage   83.10%   83.10%   -0.01%     
==========================================
  Files         164      164              
  Lines       22254    22254              
  Branches       29       29              
==========================================
- Hits        18495    18494       -1     
- Misses       3756     3757       +1     
  Partials        3        3              

Flag	Coverage Δ
docusaurus	95.07% <ø> (ø)
pester	86.48% <ø> (-0.01%)	⬇️

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see 1 file with indirect coverage changes

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