feat: implement full-platform STT API (v2.3 consensus plan)

Batch+realtime transcription API: faster-whisper engine w/ EngineOwner
(single GPU owner, OOM downgrade chain, persisted attempted_profiles),
hardware-adaptive device manager (T0-T3 VRAM tiers), Redis/in-proc job
queue w/ leases + crash recovery, postprocess (glossary/rules/LLM w/
egress guard), privacy-first result store (UUID keys, source deleted
after transcribe), retention sweeper, API-key auth (HMAC digests,
scopes, job ownership), WebSocket realtime lane (LocalAgreement),
CLI (detect/transcribe/bench/serve/key), Docker, benchmark runner.

127 mock-based tests pass; ruff clean. Includes verification checklist
and autoplan review notes.

pyproject.toml

@@ -0,0 +1,58 @@
+[project]
+name = "luke-scribe"
+version = "0.1.0"
+description = "내부용 로컬 STT 전사 API — faster-whisper, hardware-adaptive, privacy-first"
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "pydantic>=2.7",
+    "pydantic-settings>=2.3",
+    "typer>=0.12",
+    "rich>=13.7",
+    "psutil>=5.9",
+    "nvidia-ml-py>=12.535",
+    "huggingface-hub>=0.24",
+]
+
+[project.optional-dependencies]
+# 엔진 — transcribe/bench (faster-whisper/CTranslate2)
+engine = ["faster-whisper>=1.0.3", "av>=11"]
+# GPU CUDA 런타임 (faster-whisper GPU 추론 시)
+gpu = ["nvidia-cublas-cu12", "nvidia-cudnn-cu12"]
+# 동기 배치 API (serve)
+api = ["fastapi>=0.110", "uvicorn[standard]>=0.29", "python-multipart>=0.0.9"]
+# P2 비동기 큐 (Redis/RQ no-fork)
+queue = ["redis>=5.0", "rq>=1.16"]
+# P5 옵션
+diarize = ["pyannote.audio>=3.1"]
+llm = ["openai>=1.30"]
+
+[dependency-groups]
+dev = ["pytest>=8.2", "ruff>=0.5", "httpx>=0.27"]
+
+[project.scripts]
+luke-scribe = "luke_scribe.cli:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/luke_scribe"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-q"
+
+[tool.ruff]
+line-length = 100
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "W", "UP", "B"]
+ignore = ["E501"]
+
+[tool.ruff.lint.per-file-ignores]
+# FastAPI/typer는 Depends()/Option() 호출을 인자 기본값에 쓰는 패턴이 표준
+"src/luke_scribe/api/**" = ["B008"]
+"src/luke_scribe/cli.py" = ["B008"]