docs+release: v2.1.15 — document every download (lean vs full) + bump

Add a 'Which download should I get?' matrix to installation.md explaining all 12 release
assets (lean vs full, per-OS, what each bundles + needs, best-for). Bump 2.1.14 -> 2.1.15
across code + all blueprints. Regenerate the 8 tracked customer PDFs. (Ships alongside the
server chat-model preload fix + new full Linux tar/AppImage variants.)

Author: ShadowESC95

blueprints/ELI_USER_MANUAL.pdf

@@ -25,7 +25,7 @@
 from eli.core.paths import project_root as _project_root
 PROJECT_ROOT = _project_root()
 _DEFAULT_RELEASE_REPO = os.environ.get("ELI_RELEASE_REPO", "ShadowESC95/ELI_v2.0")
-_DEFAULT_RELEASE_TAG = os.environ.get("ELI_RELEASE_TAG", "v2.1.14")
+_DEFAULT_RELEASE_TAG = os.environ.get("ELI_RELEASE_TAG", "v2.1.15")
 
 
 def _run(cmd: List[str], cwd: Optional[Path] = None, timeout: int = 120) -> Dict[str, Any]:

blueprints/ELI_USER_MANUAL_FULL.pdf

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "eli-v2.0"
-version = "2.1.14"
+version = "2.1.15"
 description = "ELI v2.0 — Local cognitive runtime, assistant GUI, memory, tools, and GGUF inference"
 readme = "README.md"
 requires-python = ">=3.10"