chore(main): release 1.6.8

[github-actions]

🤖 I have created a release beep boop

1.6.8 (2026-07-07)

Documentation

• audits: add program completeness review + reconcile roadmap and Rival design (d4bdb4e)
• audits: add RAG layer audit plan (b747de6)
• audits: add RAG layer audit plan (3603e73)
• audits: add voice stack audit plan (e6594af)
• audits: add voice stack audit plan (e61356e)
• audits: program completeness review + roadmap/Rival reconciliation (d41e957)
• audits: promote program completeness review + reconciliation to main (c7409c1)
• audits: promote RAG layer audit to main (1366f8c)
• audits: promote voice stack audit to main (51527f3)
• research: add agent-orchestration-flow design (e18c4d6)
• research: add agent-orchestration-flow design (2a9d691)
• research: add ecosystem data-contracts spec (4bc37ba)
• research: add ecosystem data-contracts spec (7b2c38e)
• research: promote agent-orchestration-flow design to main (f5b61f4)
• research: promote ecosystem data-contracts spec to main (f8e7303)

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[strix-security]

Strix Security Review

Security review could not be completed for this commit.

_{Updated for 4c40e09.}

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Reviewed by Strix
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