doc: fix diagram syntax error and move pipeline meta-docs to separate page

[spoorcc]

• Fix PlantUML syntax error in security_doc_flow.puml: replace unsupported
  #line.dashed;back:color combined style (not available in plantuml ≤2020)
  with a stereotype-based skinparam block (skinparam package<<assess>>)
• Move the "Security Documentation Pipeline" section out of security.rst
  into a new security_pipeline.rst, so the security model page focuses on
  the model itself rather than implementation details
• Add a brief cross-reference paragraph and toctree entry in security.rst
  pointing to the new page

https://claude.ai/code/session_01QfePU2NybeWt7GnCiZg42s

Summary by CodeRabbit

• Documentation
  • Enhanced security documentation with a comprehensive guide to security and compliance pipelines, including threat-model components, compliance tracking processes, and release verification artifacts
  • Updated visual diagrams to improve clarity of security pipeline workflows

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 46a99a07-11ef-4d44-93b6-9946d8cf9d56

📥 Commits

Reviewing files that changed from the base of the PR and between 91b13e3 and 623c42a.

📒 Files selected for processing (3)

• doc/explanation/security.rst
• doc/explanation/security_pipeline.rst
• doc/static/uml/security_doc_flow.puml

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Walkthrough

The inline "Security Documentation Pipeline" section in security.rst is removed and replaced by a cross-reference note and toctree entry pointing to a new security_pipeline.rst page. The new page documents the threat-model pipeline, compliance pipeline, release attestations, dependency-scanning outputs, and an artifact summary table. The PlantUML diagram gains a skinparam package<<assess>> rule that replaces prior inline styling on the p_assess package.

Changes

Security Pipeline Documentation Refactor

Layer / File(s)	Summary
New security_pipeline.rst page doc/explanation/security_pipeline.rst	Adds a 121-line RST page describing the threat-model pipeline (tm_supply_chain.py, tm_usage.py, threats.json, tm_render.py), compliance pipeline (compliance_data.py, compliance.py, OSCAL JSON), release attestations, dependency-scanning outputs (SARIF/Code Climate/Jenkins), and an "Artifacts at a glance" list-table.
security.rst cross-reference and toctree update doc/explanation/security.rst	Replaces 112 lines of inline pipeline content with a 4-line note referencing security_pipeline, and adds security_pipeline to the Sphinx toctree under "Threat Models".
PlantUML assess package stereotype styling doc/static/uml/security_doc_flow.puml	Adds a global skinparam package<<assess>> block setting background color and dashed border; updates the p_assess package declaration to use <<assess>> stereotype instead of inline #line.dashed;back: modifiers.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• dfetch-org/dfetch#1181: Modifies the same doc/explanation/security.rst file, introducing the product security context content that this PR now partially replaces with a cross-reference.
• dfetch-org/dfetch#1276: Directly overlaps by modifying both doc/explanation/security.rst and doc/static/uml/security_doc_flow.puml for the pipeline section and diagram that this PR refactors.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the two main changes: fixing a PlantUML diagram syntax error and reorganizing pipeline documentation into a separate page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/security-docs-diagram-restructure-pze8qk

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