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/fg3-4/uapf.yaml

@@ -0,0 +1,16 @@
+kind: uapf.package
+id: vk.gramatvediba.fg3-4
+name: "FG3-4 — Saimnieciskā norēķina veikšana"
+description: "Economic settlement: handling of advances, petty-cash and other economic settlements with employees and counterparties."
+level: 4
+version: 0.1.0
+includes: []
+cornerstones:
+  bpmn: false
+  dmn: false
+  cmmn: false
+  resources: false
+owners:
+  - type: team
+    id: vpc
+lifecycle: draft