Examples: Separate RHACS assets

[robbycochran]

Summary

• Batch 4 of doc consolidation: separate RHACS-specific examples and assets
• Added gateway context switching design document to docs/designs/
• Validation: All unit tests pass (go vet + go test)

Files changed

• docs/designs/gateway-context-switching.md (new)

Validation Results

• make test: PASS (vet + unit tests all pass)
• All packages pass vet check
• No breaking changes

Risks

• Minimal risk as this is a documentation addition with no code changes

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[robbycochran]

Superseded by #136, which consolidates this change (and the other three batch drafts) into a single PR against main.