Replace pyreadr

[jakubnowicki]

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Description

Clear and concise description of what changed and why.
If necessary, include screenshots and/or a step-by-step guide on how to test the changes.

Definition of Done

• The change is thoroughly documented.
• The CI passes (R CMD check, linter, unit tests, spelling).
• Any generated files have been updated (e.g. .Rd files with roxygen2::roxygenise())

[Copilot]

Pull request overview

This PR replaces pyreadr with rdata for reading .rds files, and aligns the project/tooling with a Python 3.11+ baseline.

Changes:

• Swap the RDS reader implementation from pyreadr to rdata, adding custom constructors for Date and POSIXct (with NaN-aware conversions).
• Add unit tests covering the new constructors and datetime type inference behavior.
• Bump minimum supported Python to 3.11 and update CI matrix/versioning accordingly.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tealflow_mcp/utils/dataset_readers.py	Re-implements RDS loading via rdata, adds Date/POSIXct constructors and datetime type inference.
tests/test_dataset_readers.py	Adds tests for NaN-safe constructors and _infer_datetime_type.
pyproject.toml	Replaces pyreadr with rdata, bumps Python requirement to >=3.11, updates tooling targets.
.github/workflows/ci.yml	Updates CI Python versions to 3.11–3.13 and adjusts coverage run version.
tealflow_mcp/__init__.py	Version bump to 0.2.0.dev2.
uv.lock	Lockfile refresh reflecting dependency switch and Python version bump.

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