fix: render .env.example template in agentex init

[danielmillerp]

Summary

• The .env.example.j2 template file was added to every template directory but never wired into init.py, so generated projects silently lacked a .env.example.
• Adds .env.example.j2 → .env.example to the root_templates dict so every template type emits the file.
• Fixes the friction where users have to put LITELLM_API_KEY directly into manifest.yaml because there's no obvious place to put it locally.

Test plan

• Run agentex init for each template type (sync, sync-openai-agents, sync-langgraph, default, default-langgraph, temporal, temporal-openai-agents) and confirm .env.example appears in the project root with the expected LITELLM_API_KEY= / commented OPENAI_BASE_URL= placeholders
• Confirm rendered .env.example substitutes {{ agent_name }} correctly in the header comment

🤖 Generated with Claude Code

Greptile Summary

Wires the pre-existing .env.example.j2 template into the root_templates dict in create_project_structure, so every agentex init run now emits a .env.example file in the project root. All 7 template directories already contained identical .env.example.j2 files, and the {{ agent_name }} placeholder resolves correctly from the existing context dict.

Confidence Score: 5/5

Safe to merge — minimal, correct one-line fix with all template files already in place.

Single-line addition to a dict; template files exist in all 7 template directories, the Jinja2 variable resolves correctly, and there are no side effects or regressions.

No files require special attention.

Important Files Changed

Filename	Overview
src/agentex/lib/cli/commands/init.py	Single-line addition to root_templates dict; correct and complete — all 7 template directories have the corresponding .env.example.j2 file and the agent_name context variable is already provided.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[agentex init] --> B[User selects template type]
    B --> C[create_project_structure]
    C --> D[Render project/ files\nacp.py, workflow.py, etc.]
    C --> E[Render root_templates]
    E --> F[.dockerignore]
    E --> G[.env.example NEW]
    E --> H[manifest.yaml]
    E --> I[README.md]
    E --> J[environments.yaml]
    E --> K[Dockerfile / pyproject.toml]
    E --> L[dev.ipynb]
    G --> M[Written to project root\nwith agent_name substituted]

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
src/agentex/lib/cli/commands/init.py:293-299
**Post-init guidance doesn't mention the new `.env.example`**

The PR's stated goal is to reduce friction around `LITELLM_API_KEY` setup, but the "Development Setup" step 3 only shows `uv venv && uv sync && source .venv/bin/activate` without prompting users to copy `.env.example` → `.env` and fill in the key. A user who doesn't notice the generated file would still hit the same friction. Adding a line like `cp .env.example .env  # then add your LITELLM_API_KEY` here would close the loop.

_{Reviews (1): Last reviewed commit: "fix: render .env.example template in age..." | Re-trigger Greptile}

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