Polish DevMind project presentation

.env.example

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+# Required
+ANTHROPIC_API_KEY=your-anthropic-api-key
+
+# Model
+DEVMIND_MODEL=claude-sonnet-4-6
+DEVMIND_MAX_TOKENS=4096
+
+# Reliability
+DEVMIND_MAX_RETRIES=4
+DEVMIND_RETRY_BASE_DELAY=1.0
+DEVMIND_RETRY_MAX_DELAY=30.0
+DEVMIND_RATE_LIMIT=true
+DEVMIND_RPM=50
+DEVMIND_BURST=10
+
+# Tools
+DEVMIND_BASH_TIMEOUT=30
+
+# Sessions and observability
+DEVMIND_PERSIST=true
+DEVMIND_AUTOSAVE=5
+DEVMIND_METRICS=true
+DEVMIND_PLUGINS=true
+DEVMIND_LOG_LEVEL=INFO
+DEVMIND_LOG_JSON=false
+DEVMIND_DEBUG=false

.gitignore

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 .env
 .env.*
 *.env
+!.env.example
 
 # ===== Python cache =====
 __pycache__/

CONTRIBUTING.md

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+# Contributing
+
+Thanks for helping improve DevMind.
+
+## Development setup
+
+```bash
+python -m venv .venv
+pip install -r requirements-dev.txt
+```
+
+Activate the environment, then run the quality gates:
+
+```bash
+ruff check .
+black --check .
+mypy .
+pytest -q
+```
+
+The test suite must run without an Anthropic API key and without paid API calls.
+
+## Pull requests
+
+1. Keep each change focused and explain its user-visible behavior.
+2. Add or update tests for logic, security, persistence, or tool changes.
+3. Preserve support for Python 3.11 and for Git Bash on Windows.
+4. Do not commit `.env`, API keys, logs, metrics, costs, or saved sessions.
+5. Call out any change that expands file access or shell execution.
+
+## Bug reports
+
+Include the operating system, Python version, command used, expected behavior, and a minimal traceback with secrets removed. Security issues should follow [SECURITY.md](SECURITY.md), not a public issue.

LICENSE

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+MIT License
+
+Copyright (c) 2026 PRINCE2-AI
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.