Fix compile errors so Gen.03 core builds and tests pass

Built locally with GNAT 13.3 (gprbuild, -gnat2022). All four test suites
(soul/trust/cycle/config) pass and the MCP server responds correctly to
initialize / tools/list / tools/call over stdio.

Fixes:
- soul-state.ads: move session storage types (Session_Key/Slot/Table) out of
  the protected definition's private part (only data components are legal
  there) into the package visible part.
- soul-state.ads: drop pre/postconditions that call the object's own
  protected function Is_Initialized (illegal internal call in a contract);
  the guards already live in the bodies.
- mafiabot_types.ads: pin Axis_Value'Small to 0.01 so 1.0 doesn't land one
  past the signed-8-bit base range (GNAT default 2**-7 small).
- config_loader.ads: name the Entries array type (anonymous arrays may not be
  record components).
- ada_medium.adb: qualify Mafiabot_Types.Ada_Medium (the package name shadows
  the Organ_Id literal); fix a malformed Bounded_Text aggregate.
- soul-state.adb: fix Bounded_Text aggregate and the single-Character Footer.
- soul-celtic_cross.adb / soul_tests.adb: 'use type' for Slot_State equality.
- hermes_protocol.adb: qualify a single-char String aggregate to disambiguate
  the Append overloads.
- Remove soul.adb (empty body for a spec that does not allow one).
- Add .gitignore for build artifacts and the Alire-generated config project.

mafiabot_core/tests/soul_tests.adb

@@ -4,6 +4,8 @@ with Soul.Tarot;
 with Soul.Celtic_Cross;
 with Mafiabot_Types; use Mafiabot_Types;
 
+use type Soul.Tarot.Slot_State;
+
 procedure Soul_Tests is
    Fails : Natural := 0;