arigraph: remove the S1 similarity probe; add EpisodicMemory::basins() (structure, not similarity)

.claude/board/AGENT_LOG.md

@@ -1,3 +1,17 @@
+## 2026-07-18 — EpisodicMemory::basins() — usable episodic-witness basin partition (operator directive: "usable code, not paper churn") — main thread
+
+- **Task:** the operator asked for the AriGraph episodic-witness basins as USABLE CODE (not a probe, not jc-coupled). AriGraph had `communities()` (structural, #714) but no experiential partition (`grep basin` → nothing). Built the complement.
+- **Change:** `arigraph/episodic.rs` — `EpisodicBasins { entities, labels, num_basins }` + `basin_of`/`members` (same accessor shape as `Communities`, so caller can compare the two partitions directly) and `EpisodicMemory::basins()`: deterministic union-find over per-episode entity **co-occurrence** (parse each `"subject - relation - object"` triplet, union all entities seen in one episode), sorted-entity + union-by-lower-root → stable partition. Re-exported in `arigraph/mod.rs`.
+- **Honest scope:** this is the experiential complement to `communities()` — entities grouped by *what was observed together*, NOT the le-contract 6-slot horizontal `basin:role` register frame (that stays EVENTUAL per `context-role-traversal-tissue.md`). No similarity pooling; structure only.
+- **Verified:** `cargo test -p lance-graph --lib -- graph::arigraph::episodic` 16/16 green (5 new basin tests: co-occurrence grouping, shared-entity merge, single-episode union, empty-safe, deterministic); clippy clean on the additions. Branch `claude/happy-hamilton-0azlw4`.
+
+## 2026-07-18 — REMOVED the S1 community-basin probe + jc dev-coupling (operator directive: "I don't want it in the JC crate") — main thread
+
+- **Task:** the S1 real-corpus probe pooled typed relation planes into a similarity scalar and produced a retracted "mint" verdict; operator ruled it an embarrassment coupled to the scientific jc crate. Removed the entire probe line.
+- **Change (branch reset to clean main, single commit):** deleted `examples/p_community_basin_agree.rs`; removed `jc = { path = "../jc" }` from `crates/lance-graph/Cargo.toml` + Cargo.lock (jc was reachable only via this dev-dep); the #722-only real-corpus example + schema.org data blob + python extractor never merged (dropped on reset). G0 harness (#716) untouched (no jc).
+- **Verified:** `cargo build -p lance-graph --examples` green without jc; only remaining example is `g0_graph_loadbearing.rs`.
+- **Board:** EPIPHANIES `E-S1-PROBE-REMOVED-1`. PR #722 repurposed to the removal; force-pushed onto clean main.
+
 ## 2026-07-17 — E-CONTEXT-ROLE-TISSUE-1 capture — connecting-tissue traversal doctrine (main thread, no subagents)
 
 - **Task:** capture the operator's context:role generalization (vertical HHTL / horizontal 6-context) and find the clean cross-domain reuse (screens, documents, time series, AriGraph) with classid+appid+ClassView/WideFieldMask.

.claude/board/EPIPHANIES.md

@@ -1,3 +1,11 @@
+## 2026-07-18 — E-S1-PROBE-REMOVED-1 — the S1 community-basin probe and the lance-graph `jc` dev-coupling are REMOVED. The probe pooled ~1450 typed relation planes into one undirected similarity graph and read a scalar φ as a "community-id earns the mint" verdict — a flattening artifact. jc is the scientific crate; this empirical probe does not belong coupled to it.
+
+**Status:** SHIPPED (deletes `crates/lance-graph/examples/p_community_basin_agree.rs`; removes the `jc` dev-dependency from lance-graph `Cargo.toml` + `Cargo.lock`. The #722-only real-corpus variant + its schema.org data blob + python extractor never merged and are dropped by resetting the branch to clean main.)
+
+- **What was wrong.** The probe collapsed typed structure — every relation is its own context:role plane — into one weight-summed adjacency, partitioned the blob, and reported a scalar agreement as a decision. Structure ≠ similarity; the `(8:8)`/ClassView substrate exists to enforce exactly that, and the probe violated it *after* the rule had been stated. The "DISTINCT → community-id earns the mint" verdict was retracted; the whole probe line is now removed rather than iterated.
+- **Stands on its own (unaffected):** the context:role traversal-tissue doctrine (`E-CONTEXT-ROLE-TISSUE-1`), the jc-scientific / empirical boundary (`E-EMPIRICAL-VS-SCIENTIFIC-JC-1`), the G0 harness (#716, no jc). The community≡basin identity (`E-GRAPHRAG-DGR3B-1`) is an UNRUN hypothesis again — there is no valid probe for it in-tree.
+- **Rule (operator, reinforced):** no empirical probe of mine sits next to or dev-depends on jc. A community/basin agreement, if ever measured, is decomposed per typed plane and does not borrow jc's adjacency.
+
 ## 2026-07-17 — E-CONTEXT-ROLE-TISSUE-1 — operator ruling: `part_of:is_a` ≡ **context:role**, one polymorphic `6×(8:8)` register with TWO orientations — VERTICAL (stacked exactness = HHTL family identity, q2-FMA-helix-attested) and HORIZONTAL (6-context / episodic-witness `basin:role`, eventual) — reused with classid+appid+ClassView/WideFieldMask as the CONNECTING-TISSUE TRAVERSAL for screens, documents, time series, and AriGraph
 
 **Status:** CAPTURED (knowledge doc `.claude/knowledge/context-role-traversal-tissue.md`, this commit). Doctrine + reuse checklist + probe pair; no code this arc (the anchors already exist — that is the finding).

crates/lance-graph/Cargo.toml

@@ -103,5 +103,4 @@ lance-index = "=7.0.0"
 tempfile = "3"
 tokio = { version = "1.37", features = ["macros", "rt-multi-thread"] }
 causal-edge = { path = "../causal-edge" }
-jc = { path = "../jc" }
 lance-graph-planner = { path = "../lance-graph-planner" }