feat: Intelligence Pipeline v3 — full implementation

Multi-stage evidence-grounded inference architecture replacing the
monolithic 9B model extraction pipeline. CPU-first specialist services
handle routine extraction while the 9B vLLM model is preserved for
semantic adjudication of ambiguous cases.

Key components:
- Capability-aware inference gateway (OpenAI-compatible + Ollama)
- Endpoint registry with DB migrations and REST API
- Sentence-aware document segmenter (property tests)
- Deterministic financial parsing with offset integrity
- Symbol resolution with ambiguity detection
- Specialist service (GLiNER2, dynamic batching, K8s deployment)
- Company-specific sentiment (FinBERT, calibration)
- Retrieval-based novelty and duplicate detection
- Confidence calibration pipeline
- Deterministic routing engine (property tests)
- 9B adjudication layer with VRAM gating
- Stock-specific impact model (features, labels, baseline, trained)
- Pipeline orchestrator (state machine, queues, leases, feature flags)
- Bounded parallelism (async workers, semaphore, load shedding)
- Observability (tracing, metrics, alerts)
- Compatibility adapter (v3→v2 golden mapping tests)
- Shadow/canary promotion framework
- Active learning and fine-tuning pipeline

Test results: 1,161 tests pass, ruff lint clean.
All 282 spec tasks completed.

services/intelligence_pipeline_v3/compatibility/config.py

@@ -0,0 +1,39 @@
+"""Feature flag configuration for the compatibility adapter.
+
+The adapter is disabled by default and must be explicitly enabled for
+replay, shadow, canary, or production modes.
+"""
+
+from __future__ import annotations
+
+from enum import Enum
+
+
+class AdapterMode(str, Enum):
+    """Operating mode for the compatibility adapter.
+
+    - disabled: adapter does not run (default)
+    - replay_only: adapter runs during offline replay evaluation
+    - shadow_only: adapter runs in shadow mode (no downstream effect)
+    - canary: adapter outputs routed to a percentage of non-trading consumers
+    - production: adapter outputs used for all consumers
+    """
+
+    DISABLED = "disabled"
+    REPLAY_ONLY = "replay_only"
+    SHADOW_ONLY = "shadow_only"
+    CANARY = "canary"
+    PRODUCTION = "production"
+
+
+def is_adapter_enabled(mode: AdapterMode) -> bool:
+    """Return True if the adapter should produce output in the given mode.
+
+    Only replay, shadow, canary, and production modes enable output.
+    The disabled mode prevents any adapter execution.
+    """
+    return mode != AdapterMode.DISABLED
+
+
+# Default mode — adapter is OFF until explicitly activated
+DEFAULT_ADAPTER_MODE: AdapterMode = AdapterMode.DISABLED