wip: implement hybrid history-aware retriever strategy

[FAUST-BENCHOU]

PLEASE FILL IN THE PR DESCRIPTION BELOW AND CONFIRM THE CHECKLIST ITEMS.

Closes #xxxx

Purpose

• What does this PR change?
• Why is this change needed?
• Which module(s) does this affect? Router / CLI / Dashboard / Operator / Fleet-Sim / Bindings / Training / E2E / Docs / CI/Build

Test Plan

• What commands, checks, or manual steps should reviewers use?
• Why is this validation sufficient for the affected module(s)?

Test Result

• What were the actual results?
• Any follow-up risks, gaps, or blockers?

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Semantic Router PR Checklist

• PR title uses module-aligned prefixes such as [Router], [CLI], [Dashboard], [Operator], [Fleet-Sim], [Bindings], [Training], [E2E], [Docs], or [CI/Build]
• If the PR spans multiple modules, the title includes all relevant prefixes
• Commits in this PR are signed off with git commit -s
• The Purpose, Test Plan, and Test Result sections reflect the actual scope, commands, and blockers for this change

See CONTRIBUTING.md for the full contributor workflow and commit guidance.

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✅ Supply Chain Security Report — All Clear

Scanner	Status	Findings
AST Codebase Scan (Py, Go, JS/TS, Rust)	✅	27 finding(s) — MEDIUM: 21 · LOW: 6
AST PR Diff Scan	✅	No issues detected
Regex Fallback Scan	✅	No issues detected

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Scanned at 2026-04-28T08:16:58.942Z · View full workflow logs