feat: Phase 0 — promote SPO from extensions/ to top-level src/spo/

SPO, BNN, and CLAM are no longer experimental. They are the core cognitive
substrate, always-on with no feature gates.

Moves:
- src/extensions/spo/*.rs → src/spo/ (6 core files)
- src/extensions/{context_crystal,meta_resonance,nsm_substrate,
  codebook_training,deepnsm_integration,cognitive_codebook,
  crystal_lm,sentence_crystal}.rs → src/spo/ (8 spo-gated modules)

Updates:
- lib.rs: add `pub mod spo`, remove "spo" from extensions cfg gate
- extensions/mod.rs: strip all #[cfg(feature = "spo")] entries
- Cargo.toml: rename "spo" feature to "spo_jina" (only reqwest needs gating)
- Fix crate::extensions::spo:: → crate::spo:: in shift_detector + crystal_lm
- Fix super::spo::jina_embed_curl → super::jina_embed_curl in sentence_crystal

Zero compilation errors. All SPO tests pass (40+ tests green).

Note: sentence_crystal.rs and grammar.rs flagged as future promotion
candidates to rustynum — their encoding logic overlaps with what the
SPO harvest pipeline now provides natively at the BNN level.

https://claude.ai/code/session_0152b2NJYnjCJjvMAmgsTx3p

Author: claude

Cargo.toml

@@ -24,7 +24,7 @@ crate-type = ["cdylib", "rlib"]
 # =============================================================================
 
 [features]
-default = ["simd", "parallel", "lancedb", "crewai", "spo"]
+default = ["simd", "parallel", "lancedb", "crewai", "spo_jina"]
 
 # Core features
 simd = []                        # AVX-512 SIMD for Hamming operations
@@ -40,9 +40,8 @@ redis = ["dep:redis"]            # Redis caching
 python = ["pyo3"]                # Python bindings
 codebook = []                    # Cognitive codebook (NSM, NARS, etc.)
 hologram = []                    # Holographic reduced representations
-# spo and rustynum-bnn are OBLIGATORY — always included after rustynum integration.
-# Feature flag kept as no-op for backwards compatibility only.
-spo = ["reqwest"]
+# SPO is always-on (no feature gate). Only the Jina HTTP client needs reqwest.
+spo_jina = ["reqwest"]
 compress = ["lz4"]               # Compression support
 quantum = []                     # Quantum-inspired operators
 bench = []                       # Benchmark suite (comparison vs Qdrant/Milvus)
@@ -60,7 +59,7 @@ vendor-crewai = []
 # All features
 full = [
     "simd", "parallel", "python",
-    "codebook", "hologram", "spo", "compress", "quantum",
+    "codebook", "hologram", "spo_jina", "compress", "quantum",
     "lancedb", "neo4j", "redis"
 ]
 

src/extensions/mod.rs

@@ -1,39 +1,14 @@
 //! Optional Extensions for LadybugDB
 //!
-//! Enable via Cargo features: `codebook`, `hologram`, `spo`, `compress`
+//! Enable via Cargo features: `codebook`, `hologram`, `compress`
+//!
+//! Note: SPO modules have been promoted to `crate::spo` (top-level, always-on).
 
 #[cfg(feature = "codebook")]
 pub mod codebook;
 
 #[cfg(feature = "hologram")]
 pub mod hologram;
 
-#[cfg(feature = "spo")]
-pub mod spo;
-
-#[cfg(feature = "spo")]
-pub mod context_crystal;
-
-#[cfg(feature = "spo")]
-pub mod meta_resonance;
-
-#[cfg(feature = "spo")]
-pub mod nsm_substrate;
-
-#[cfg(feature = "spo")]
-pub mod codebook_training;
-
-#[cfg(feature = "spo")]
-pub mod deepnsm_integration;
-
-#[cfg(feature = "spo")]
-pub mod cognitive_codebook;
-
-#[cfg(feature = "spo")]
-pub mod crystal_lm;
-
-#[cfg(feature = "spo")]
-pub mod sentence_crystal;
-
 #[cfg(feature = "compress")]
 pub mod compress;

src/extensions/spo/mod.rs

@@ -113,15 +113,15 @@ pub mod spectroscopy;
 pub mod qualia;
 pub mod mul; // Meta-Uncertainty Layer (10-layer metacognition)
 pub mod cypher_bridge; // Cypher string → BindSpace operations (neo4j-rs bridge)
+pub mod spo; // Subject-Predicate-Object — core cognitive substrate (always-on)
 
 // === Unified execution contract (crewai-rust × ada-n8n integration) ===
 pub mod contract;
 
-// === Optional extensions ===
+// === Optional extensions (codebook, hologram, compress only) ===
 #[cfg(any(
     feature = "codebook",
     feature = "hologram",
-    feature = "spo",
     feature = "compress"
 ))]
 pub mod extensions;

src/lib.rs

@@ -45,7 +45,7 @@
 //! Total: ~230 built-in + ~100 learned ≈ 330 concepts
 
 use crate::core::Fingerprint;
-use crate::extensions::cognitive_codebook::{
+use crate::spo::cognitive_codebook::{
     CognitiveAddress, CognitiveCodebook, CognitiveDomain, NarsCopula, QualiaChannel, ThematicRole,
     YamlTemplate, fold_to_48,
 };