docs: consolidate support-boundary records

[sunib]

Summary

• make the support contract and README the accurate, compact entry point
• replace two completed prompt documents with one concise active patch-authoring record
• preserve focused policy and implementation records, including verification diagrams
• label new external-base overlay resources and discovery classification as planned follow-ups

Validation

• task lint-docs

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9edafad1-7b77-4b36-8c03-3350c6f0de34

📥 Commits

Reviewing files that changed from the base of the PR and between e9d6be1 and 15a2e8f.

📒 Files selected for processing (16)

• docs/design/support-boundary/README.md
• docs/design/support-boundary/acceptance-precision.md
• docs/design/support-boundary/expansion-boundary-and-corpus-organisation.md
• docs/design/support-boundary/finished/images-and-replicas-edit-through.md
• docs/design/support-boundary/gittarget-granularity-and-cross-environment-edits.md
• docs/design/support-boundary/kustomize-support-boundary.md
• docs/design/support-boundary/next-prompt-render-matches-live-gate.md
• docs/design/support-boundary/next-prompt-simple-patches.md
• docs/design/support-boundary/orchestrator-knowledge-boundary.md
• docs/design/support-boundary/patch-authoring.md
• docs/design/support-boundary/render-attribution.md
• docs/design/support-boundary/render-fidelity.md
• docs/design/support-boundary/render-root-scoping.md
• docs/design/support-boundary/repo-discovery-and-onboarding-scan.md
• docs/design/support-boundary/support-contract.md
• docs/design/support-boundary/unreflectable-edits-and-write-gating.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs-boundary-consolidation

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