feat: deep-agent canvas, live observability, and multi-environment tooling

Self-hosted platform for building, testing, and shipping LangChain/LangGraph agents. Deep-agent sub-agents on the canvas, a live tracing/observability timeline, auto-provisioned built-in tools with import/export, per-environment tool variables, streamed evaluations, and per-user auth token forwarding.

apps/api/tests/test_semantic_cache.py

@@ -0,0 +1,32 @@
+"""Semantic response cache: paraphrased questions hit the cache."""
+
+from __future__ import annotations
+
+from forge.db.base import SessionLocal
+from forge.services.semantic_cache import SemanticCacheService
+
+T, P = "t_sc", "p_sc"
+
+
+async def test_store_then_lookup_hits_on_paraphrase():
+    async with SessionLocal() as s:
+        await SemanticCacheService.store(s, T, P, "What are your business hours?", "We're open 9am-5pm ET.")
+    async with SessionLocal() as s:
+        # near-duplicate question; fake embedder gives high overlap on shared words
+        hit = await SemanticCacheService.lookup(s, T, P, "what are your business hours", threshold=0.6)
+    assert hit == "We're open 9am-5pm ET."
+
+
+async def test_lookup_miss_below_threshold():
+    async with SessionLocal() as s:
+        await SemanticCacheService.store(s, "t_m", "p_m", "How do I reset my password?", "Use the reset link.")
+    async with SessionLocal() as s:
+        hit = await SemanticCacheService.lookup(s, "t_m", "p_m", "completely unrelated rocket science", threshold=0.9)
+    assert hit is None
+
+
+async def test_ttl_expiry():
+    async with SessionLocal() as s:
+        await SemanticCacheService.store(s, "t_t", "p_t", "ping?", "pong")
+    async with SessionLocal() as s:
+        assert await SemanticCacheService.lookup(s, "t_t", "p_t", "ping?", threshold=0.5, ttl=-1) is None