chore(core): stage 1 contracts — dialog, API schemas + fixtures, integrations, monitoring, modules

Freeze interfaces between lanes A (bot), B (backend), C (dashboard) so three developers work in
parallel without touching each other's files: dialog Event/Reply + engine registry with echo stub,
integration protocols with in-memory defaults, MonitoringService with noop stub, /api/v1 schemas
with fixture-backed routes, frozen main.py wiring, config/modules.yaml + due_scales(), DAR-5,
tzdata, Andrey trajectory, lanes in WORKFLOW, ADR-010.

Refs #34

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pyproject.toml

@@ -19,6 +19,7 @@ dependencies = [
     "plotly>=5.22",
     "pandas>=2.2",
     "qrcode[pil]>=7.4",
+    "tzdata>=2026.5",
 ]
 
 [dependency-groups]
@@ -37,7 +38,7 @@ build-backend = "hatchling.build"
 packages = ["app"]
 
 [tool.ruff]
-line-length = 110
+line-length = 120
 target-version = "py311"
 extend-exclude = [".claude", "docs"]