feat: add support for AGENTS.md, infer provider based on env variables and change tokenizer

[AstraBert]

• Support AGENTS.md for custom instructions
• Infer provider from the environment based on env variables
• Change tokenizer to a more modern one and pre-load before TUI

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5939d858-a3e6-46ad-8d63-604d6aa5bf94

📥 Commits

Reviewing files that changed from the base of the PR and between 4203491 and b8dfbc5.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (10)

• README.md
• microagents-cli/Cargo.toml
• microagents-cli/src/init_env.rs
• microagents-cli/src/main.rs
• microagents-core/AGENTS.md
• microagents-core/Cargo.toml
• microagents-core/src/agent.rs
• microagents-core/src/common.rs
• microagents-core/tests/integration_test.rs
• search-evals/Cargo.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/several-improvements

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