FG3 build-out: six FG3-x sub-process packages + FG3-1 executable

Adds the six FG3 sub-process packages (processes/fg3-1 .. fg3-6) and wires
them into the FG3 (L2) package via `includes`; FG3 version 0.1.0 -> 0.2.0.

FG3-1 (Rēķina/kredītrēķina saņemšana par precēm/pakalpojumiem) is built out
as an executable L4 package:
- bpmn/rekina-sanemsana.bpmn  - 3-lane process (Nodarbinātais / VPC / Iestāde)
- dmn/rekina-parbaude.dmn     - FIRST hit-policy routing decision table
- resources/                 - roles, agent and mappings binding every user
                               task and the decision to a target
- metadata/                  - ownership, lifecycle, policies

FG3-2..FG3-6 are draft composition placeholders (L4) pending executable
build-out.

Validated against the UAPF 2.2.0 schemas (manifest, ownership, lifecycle,
policies, resource-mapping, enterprise index): all includes resolve, no
duplicated executable artifacts, BPMN/DMN well-formed, and all resource
mapping references resolve to real BPMN/DMN element ids.

processes/fg3-1/uapf.yaml

@@ -0,0 +1,61 @@
+kind: uapf.package
+id: vk.gramatvediba.fg3-1
+name: "FG3-1 — Rēķina/kredītrēķina saņemšana par precēm/pakalpojumiem"
+description: "Level 4 atomic executable process: receipt, registration, formal and substantive checking, contract/PO matching and posting of supplier invoices and credit invoices for goods and services. The FG3 demonstrator taken to executable depth (BPMN + DMN + resource mappings)."
+level: 4
+version: 0.1.0
+includes: []
+cornerstones:
+  bpmn: true
+  dmn: true
+  cmmn: false
+  resources: true
+paths:
+  bpmn: bpmn
+  dmn: dmn
+  cmmn: cmmn
+  resources: resources
+  metadata: metadata
+exposure:
+  mcp:
+    enabled: true
+    runnable: true
+    exposedEntrypoints:
+      - process: Process_RekinaSanemsana
+        tool: vk.fg3-1.run
+      - decision: Decision_RekinaMarsrutesana
+        tool: vk.fg3-1.evaluate-routing
+    exposedArtifacts:
+      - manifest
+      - bpmn
+      - dmn
+inputs:
+  - rekins
+  - piegadatajs
+  - iepirkuma-ligums
+outputs:
+  - iegramatots-rekins
+  - maksajuma-uzdevuma-priekslikums
+artifacts:
+  bpmn:
+    - path: bpmn/rekina-sanemsana.bpmn
+      role: primary-process
+      description: "Invoice/credit-invoice receipt, checking, contract matching and posting."
+  dmn:
+    - path: dmn/rekina-parbaude.dmn
+      role: routing-decision
+      description: "Routes the invoice to posting, manual review or return to the supplier."
+  resources:
+    - path: resources/roles.yaml
+      role: roles
+      description: "Human roles participating in the process."
+    - path: resources/agents.yaml
+      role: agents
+      description: "AI agent declared for assisted steps."
+    - path: resources/mappings.yaml
+      role: resource-mapping
+      description: "Bindings of BPMN tasks and the DMN decision to targets."
+owners:
+  - type: team
+    id: vpc
+lifecycle: draft