Continuing the graphdb implementations: class and instance completed.

ARCHITECTURE.md

@@ -530,8 +530,8 @@ SeerStoneGraphDb/
 4. ~~`graphdb_bootstrap`~~ — **done** implement loader; includes Mnesia schema/table creation~~ — **done**
 5. ~~`graphdb_mgr`~~ — **done** bootstrap detection in `init/1`; read `bootstrap_file` from env; call loader ← **next**
 7. ~~`graphdb_attr` — implement attribute library (Mnesia-backed)
-8. `graphdb_class` — implement taxonomic hierarchy (Mnesia-backed)
-9. `graphdb_instance` — implement compositional hierarchy + inheritance (Mnesia-backed)
+8. ~~`graphdb_class` — implement taxonomic hierarchy (Mnesia-backed)~~ — **done**
+9. ~~`graphdb_instance` — implement compositional hierarchy + inheritance (Mnesia-backed)~~ — **done**
 10. `graphdb_mgr` — route public API calls to workers
 11. `graphdb_rules` — rule storage and enforcement
 12. `graphdb_language` — query parser and executor

CLAUDE.md

@@ -49,8 +49,8 @@ seerstone (application)
               │     ├── graphdb_mgr       (gen_server — implemented: bootstrap init, read API, category guard)
               │     ├── graphdb_rules     (gen_server — stub, implementation pending)
               │     ├── graphdb_attr      (gen_server — implemented: seeds + create/lookup API)
-              │     ├── graphdb_class     (gen_server — stub, implementation pending)
-              │     ├── graphdb_instance  (gen_server — stub, implementation pending)
+              │     ├── graphdb_class     (gen_server — implemented: taxonomic hierarchy, QC inheritance)
+              │     ├── graphdb_instance  (gen_server — implemented: compositional hierarchy, inheritance)
               │     └── graphdb_language  (gen_server — stub, implementation pending)
               └── dictionary_sup (supervisor)
                     ├── dictionary_server (gen_server — stub, not yet wired to dictionary_imp)
@@ -247,7 +247,7 @@ A logical bidirectional edge is two `relationship` rows written atomically (one
 
 These are outstanding items — all previously known bugs have been fixed.
 
-- **graphdb worker modules** — five remain as gen_server stubs with no real implementation (`graphdb_rules`, `graphdb_attr`, `graphdb_class`, `graphdb_instance`, `graphdb_language`)
+- **graphdb worker modules** — two remain as gen_server stubs with no real implementation (`graphdb_rules`, `graphdb_language`)
 - **`graphdb_mgr` write operations** — `create_attribute/3`, `create_class/2`, `create_instance/3`, `add_relationship/4`, `delete_node/1`, `update_node_avps/2` return `{error, not_implemented}` pending worker implementation (Tasks 3–5); read operations and category guard are fully functional
 - **`dictionary_server` and `term_server`** — stubs not yet wired to `dictionary_imp` (Task 8)
 - **`seerstone:start/2` and `nref:start/2`** — non-normal start types (`{takeover,Node}`, `{failover,Node}`) hit `?NYI`; only relevant in distributed/failover deployments

TASKS.md

@@ -124,7 +124,7 @@ naming and relationships. Attribute nodes live in the `nodes` Mnesia table with
 
 ---
 
-## Task 4 — `graphdb_class` — Taxonomic Hierarchy
+## ~~Task 4 — `graphdb_class` — Taxonomic Hierarchy~~ — DONE
 
 File: `apps/graphdb/src/graphdb_class.erl`
 
@@ -136,10 +136,11 @@ inheritance. Class nodes live in the `nodes` table with `kind = class`.
 - Implement `add_qualifying_characteristic/2` (class Nref, attribute Nref)
 - Implement `get_class/1`, `subclasses/1`, `ancestors/1`
 - Implement class-level attribute inheritance: `inherited_attributes/1`
+- Seeds `qualifying_characteristic` literal attribute under Literals (nref 7)
 
 ---
 
-## Task 5 — `graphdb_instance` — Compositional Hierarchy and Inheritance
+## ~~Task 5 — `graphdb_instance` — Compositional Hierarchy and Inheritance~~ — DONE
 
 File: `apps/graphdb/src/graphdb_instance.erl`
 
@@ -233,9 +234,9 @@ Correct for the present configuration; revisit if phased startup is desired.
 | ~~1~~ | ~~`graphdb_bootstrap` + Mnesia schema~~ — **done** | 0a, 0b |
 | ~~2~~ | ~~`graphdb_mgr` startup wiring~~ — **done** | 1 |
 | ~~3~~ | ~~`graphdb_attr`~~ — **done** | 1, 2 |
-| 4 | `graphdb_class` ← **next** | 3 |
-| 5 | `graphdb_instance` | 3, 4 |
-| 6 | `graphdb_rules` | 5 |
+| ~~4~~ | ~~`graphdb_class`~~ — **done** | 3 |
+| ~~5~~ | ~~`graphdb_instance`~~ — **done** | 3, 4 |
+| 6 | `graphdb_rules` ← **next** | 5 |
 | 7 | `graphdb_language` | 5 |
 | 8 | `dictionary_server` / `term_server` | — (independent) |
 | L1 | Non-normal start types | — |
@@ -252,6 +253,6 @@ To resume this session, start a new claude or OpenCode session in this repositor
 We are resuming implementation of SeerStoneGraphDb.
 Read ARCHITECTURE.md for full design decisions and TASKS.md for the task list.
 All design questions are resolved. bootstrap.terms is complete (nrefs 1-30, BFS).
-Tasks 0a-0c, Task 1 (graphdb_bootstrap), Task 2 (graphdb_mgr startup wiring), Task 3 (graphdb_attr) are done.
-Next task: Task 4 — `graphdb_class` — Taxonomic Hierarchy (step 8 in ARCHITECTURE.md Section 12).
+Tasks 0a-0c, Task 1 (graphdb_bootstrap), Task 2 (graphdb_mgr startup wiring), Task 3 (graphdb_attr), Task 4 (graphdb_class), Task 5 (graphdb_instance) are done.
+Next task: Task 6 — `graphdb_rules` — Graph Rules (step 11 in ARCHITECTURE.md Section 12).
 ```