103 provider extension consolidation

AGENTS.md

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+<!--
+SPDX-FileCopyrightText: 2025 diffo contributors <https://github.com/diffo-dev/diffo/graphs.contributors>
+
+SPDX-License-Identifier: MIT
+-->
+
+# AGENTS.md — Diffo
+
+AI agent guidance for the Diffo source repository.
+
+## What this project is
+
+Diffo is a Telecommunications Management Forum (TMF) Service and Resource Manager, built
+on [Ash Framework](https://www.ash-hq.org/) + [AshNeo4j](https://github.com/diffo-dev/ash_neo4j) + [Neo4j](https://github.com/neo4j/neo4j). It models TMF 638/639 Service and Resource inventory and provides a Spark DSL for defining domain-specific instance, party, and place kinds.
+
+## Before making changes
+
+1. Read `usage-rules.md` — Diffo-specific DSL rules.
+2. Read `CLAUDE.md` — dependency usage rules (Ash, Elixir, OTP, AshNeo4j, Spark).
+3. Consult the skill at `.claude/skills/diffo-framework/` for Ash ecosystem patterns.
+
+## Project structure
+
+```
+lib/diffo/provider/
+  extension.ex                  # Unified Spark DSL extension (provider do)
+  extension/
+    info.ex                     # Runtime introspection via Spark.InfoGenerator
+    characteristic.ex           # Characteristic build helpers
+    feature.ex                  # Feature build helpers
+    instance_role.ex            # InstanceRole struct
+    party_declaration.ex        # PartyDeclaration struct
+    place_declaration.ex        # PlaceDeclaration struct
+    party_role.ex               # PartyRole struct (Party/Place kinds)
+    place_role.ex               # PlaceRole struct (Party/Place kinds)
+    persisters/                 # Spark transformers — bake DSL state into module
+    transformers/               # TransformBehaviour — action argument injection
+    verifiers/                  # Compile-time DSL correctness checks
+  base_instance.ex              # Ash Fragment for Instance resources
+  base_party.ex                 # Ash Fragment for Party resources
+  base_place.ex                 # Ash Fragment for Place resources
+  components/
+    instance/extension.ex       # Thin marker (sections: []) — kind identification
+    party/extension.ex          # Thin marker
+    place/extension.ex          # Thin marker
+
+test/provider/extension/        # All provider extension tests
+  instance_transformer_test.exs
+  party_transformer_test.exs
+  place_transformer_test.exs
+  instance_verifier_test.exs
+  party_verifier_test.exs
+  place_verifier_test.exs
+  party_test.exs                # Integration: parties enforcement
+  place_test.exs                # Integration: places enforcement
+  specification_test.exs        # Integration: spec roundtrip
+  characteristic_test.exs       # Integration: characteristic creation
+  feature_test.exs              # Integration: feature creation
+  assigner_test.exs             # Integration: resource assignment
+
+test/support/
+  resources/                    # Test domain resources (Shelf, Card, Organization, etc.)
+  domains/                      # Test domains (Servo, Nbn)
+```
+
+## The unified `provider do` DSL
+
+All DSL declarations use a single `provider do` section — there is no `structure do`,
+top-level `behaviour do`, or bare `instances/parties/places do`.
+
+### Instance resources (`BaseInstance`)
+
+```elixir
+provider do
+  specification do
+    id "da9b207a-..."   # stable UUID4 — never change after first commit
+    name "myService"    # camelCase
+    type :serviceSpecification
+    major_version 1
+    description "..."
+    category "..."
+  end
+
+  characteristics do
+    characteristic :slot_value, MyApp.SlotValue
+    characteristic :ports, {:array, MyApp.Port}
+  end
+
+  features do
+    feature :advanced_routing, is_enabled?: false do
+      characteristic :policy, MyApp.RoutingPolicy
+    end
+  end
+
+  parties do
+    party :provider, MyApp.RSP           # singular, direct edge
+    parties :engineers, MyApp.Engineer, constraints: [min: 1, max: 5]
+    party_ref :owner, MyApp.Organization # no direct edge
+    party :operator, MyApp.RSP, calculate: :derive_operator
+  end
+
+  places do
+    place :installation_site, MyApp.GeographicSite
+    place_ref :billing_address, MyApp.GeographicAddress
+  end
+
+  behaviour do
+    actions do
+      create :build    # injects :specified_by, :features, :characteristics
+    end
+  end
+end
+```
+
+### Party and Place resources (`BaseParty` / `BasePlace`)
+
+```elixir
+provider do
+  instances do
+    role :provider, MyApp.BroadbandService
+    instance_ref :manages, MyApp.InternalService  # no direct edge
+  end
+  parties do
+    role :employer, MyApp.Organization
+  end
+  places do
+    role :headquarters, MyApp.GeographicSite
+  end
+end
+```
+
+## Running tests
+
+Integration tests require a running Neo4j instance.
+
+```sh
+mix test                          # full suite
+mix test test/provider/extension/ # extension tests only
+mix test path/to/test.exs:LINE    # single test
+mix test --max-failures 5         # stop early
+```
+
+## Common agent mistakes
+
+- Using old `structure do` / top-level `instances do` — use `provider do` only.
+- Using `party :role, Type, reference: true` — use `party_ref :role, Type`.
+- Calling `build_before/1` or `build_after/2` in actions — these run automatically.
+- Declaring `:specified_by`, `:features`, `:characteristics` as action arguments.
+- Editing `documentation/dsls/DSL-Diffo.Provider.Extension.md` — it is Spark-generated;
+  run `mix spark.cheat_sheets` to regenerate it.
+- Editing content between `<!-- usage-rules-start -->` markers in `CLAUDE.md` — that is
+  auto-generated by `mix usage_rules.sync`.