feat(search): enable dual-substrate auto-gating by default (opt-out via ADEN_LEXICON_OFF)#39
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…ia ADEN_LEXICON_OFF) End-to-end OFF vs ON bench with the shipped binary confirmed it never regresses and clearly helps: prose synonym-bridge R@1 0/15 -> 15/15; code rank-of-gold improved (rrf_fuse 18 -> 1, cosine_similarity 20 -> 5; harness MRR 0.216 -> 0.289). query_index now auto-gates by default (routed by query shape + corpus substrate); ADEN_LEXICON_OFF disables, ADEN_LEXICON_EXPAND / ADEN_PPMI_RERANK still force a single lever. Grounded + corpus-gated, so it no-ops where it would not help. Docs (retrieval-levers/README/CHANGELOG) updated.
This was referenced Jun 20, 2026
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commands.adoc: - asm --depth default: 3 → 2 (matches code) - mcp install: add missing --surface <essential|standard|full> flag - viz: add missing --scope and --resolution flags; remove bogus -j alias - heal: add structured flag table (--propose/--fix/--gc/--since/--apply/--watch) - status: document savings estimate output block ai-integration.adoc: - Replace two-tier Core/Extended model with three-tier Essential/Standard/Full - Fix tool assignments: search/list/communities/impact-diff were in wrong tier - Fix env var: ADEN_MCP_FULL=1 → ADEN_MCP_SURFACE=standard|full (legacy alias noted) - Document --surface flag at install time retrieval-levers.adoc: - Fix polarity: auto-gating is OFF by default, opt-in via ADEN_LEXICON_ON - Reframe ADEN_LEXICON_OFF as kill switch, not primary disable mechanism - Fix rerank trigger: code_anchor_fraction → query_looks_codey (query text only) - Fix NL-over-code behavior: expands only, does not rerank - Document PR #39/PR #40 revert history in status section architecture.adoc: - Add aden-paths node to Mermaid crate diagram - Remove duplicate aden-mcp Phase 2 row (already shipped as Phase 0) security-model.adoc: - Replace CanPerform (not a valid EdgeType) with Invokes in semantics example - Update malicious-contract-injection threat: moot since store-first (ADR-003) .agent/quick-ref.adoc: - Add --features watch caveat to aden watch entry crates/aden-cli/src/commands/init.rs: - Fix misleading "Knowledge graph built in .aden/store." message; store is in per-user data dir since ADR-003 docs/adr-008-current-implementation-state.adoc (new): - Document current scope extensions beyond original ADRs: Wave 3 edges (Supersedes/Justifies/AssociatedWith), GEN_LOGIC_VERSION=4, store-first architecture, MCP three-tier surface, dual-substrate retrieval (opt-in) Co-authored-by: RioPlay (Ernest Hamblen) <rioplay@rioplay.dev>
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What
Flips the dual-substrate retrieval levers (merged in #38) from opt-in to on by default, with an opt-out.
query_indexauto-gates by detected text (prose -> grounded OEWN expansion, code -> PPMI rerank), routed by query shape + corpus substrate.ADEN_LEXICON_OFFdisables entirely;ADEN_LEXICON_EXPAND/ADEN_PPMI_RERANKstill force a single lever.Why (end-to-end OFF vs ON bench, shipped binary)
No regression: the code lever reranks the hybrid base (never worse than hybrid), and both levers are grounded + corpus-gated, so they no-op where they would not help (prose lever needs the OEWN store; absent it, retrieval is unchanged).
Safety
cargo test --workspace: 0 failures with default-on active.cargo denyunaffected (no dep changes).Docs updated:
docs/retrieval-levers.adoc, README, CHANGELOG.