docs: add CONTRIBUTING.md

[okwn]

Summary

Adds CONTRIBUTING.md with development setup and process documentation.

Testing

N/A — documentation only.

---

Summary by cubic

Add CONTRIBUTING.md with setup, testing, linting, and PR guidelines. Also add an MIT LICENSE and fix minor ruff import-order issues to keep CI clean.

• Documentation

  • Added CONTRIBUTING.md covering Poetry setup, pytest, ruff, mypy, and PR steps.
  • Added MIT LICENSE file.
  • Added internal docs for repository state, map, PR candidates, and selected plan.

• Bug Fixes

  • Fixed ruff I001 import order in src/agentmail/core/query_encoder.py and tests/utils/test_query_encoding.py.

^{Written for commit f064ec8. Summary will update on new commits. Review in cubic}

[cubic-dev-ai]

1 issue found across 8 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="05_PR_CANDIDATES.md">

<violation number="1" location="05_PR_CANDIDATES.md:60">
P2: Documentation recommends editing auto-generated files without warning about the Fern generation workflow, creating a futile-edit maintainability risk.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[cubic-dev-ai]

P2: Documentation recommends editing auto-generated files without warning about the Fern generation workflow, creating a futile-edit maintainability risk.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At 05_PR_CANDIDATES.md, line 60:

<comment>Documentation recommends editing auto-generated files without warning about the Fern generation workflow, creating a futile-edit maintainability risk.</comment>

<file context>
@@ -0,0 +1,62 @@
+| Lint | ⚠️ | 2 fixable ruff issues (import sorting) |
+| License | ⚠️ | pyproject.toml says MIT but no LICENSE file found |
+
+## Ruff Issues Found
+1. `src/agentmail/core/query_encoder.py` - unsorted imports
+2. `tests/utils/test_query_encoding.py` - unsorted imports
</file context>