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.

README.md

@@ -40,9 +40,12 @@ disagree, the discrepancy is recorded rather than silently resolved.
 
 ## Status
 
-**Skeleton.** Workspace structure and the L0 enterprise index are in place.
-The six function-group packages and the FG3 executable build follow in
-subsequent steps.
+**FG3 build.** The workspace structure, the L0 enterprise index, the L1
+accounting domain and the six L2 function-group packages are in place. FG3 is
+composed down to its six L4 sub-process packages, and FG3-1 (*Rēķina/
+kredītrēķina saņemšana*) is built out as an executable L4 package with BPMN
+and DMN. FG2 and FG4–FG6 detailing and the FG3-2…FG3-6 executable builds
+follow in subsequent steps.
 
 ## Scope note