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.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report something that isn't working as expected
+title: "[bug] "
+labels: bug
+---
+
+**Describe the bug**
+A clear and concise description of what's wrong.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. Go to '…'
+2. Configure '…'
+3. Run '…'
+4. See error
+
+**Expected behavior**
+What you expected to happen.
+
+**Screenshots / logs**
+If applicable, add screenshots or relevant log output. **Redact any secrets, tokens, or
+customer data.**
+
+**Environment**
+- Forge version / commit SHA:
+- Deployment: local (SQLite) / Docker (Postgres) / other
+- OS & browser (for console issues):
+- Python / Node version (for local dev):
+
+**Additional context**
+Anything else that might help — workflow/tool config (redacted), provider, etc.