Robust rec collection

[NHagar]

Uses search endpoint to grab newsletter ID, rather than pulling most recent post (prone to 404s)

[Copilot]

Pull Request Overview

This PR adds code coverage tooling and refactors the get_recommendations() method to resolve publication IDs without requiring posts. The main changes include adding pytest-cov as a development dependency and implementing a new _resolve_publication_id() method that queries Substack's discovery API directly.

• Added pytest-cov for test coverage measurement
• Refactored get_recommendations() to use discovery API search instead of fetching posts
• Added comprehensive test coverage for the new resolution logic and edge cases

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyproject.toml	Added pytest-cov>=7.0.0 to dev dependencies
uv.lock	Updated lock file with coverage and pytest-cov packages
.gitignore	Added coverage-related files to gitignore
substack_api/newsletter.py	Implemented publication ID resolution via discovery API with helper functions
tests/test_newsletter.py	Added extensive test coverage for new functionality and edge cases

Comments suppressed due to low confidence (1)

substack_api/newsletter.py:273

• The module 'substack_api.newsletter' imports itself.

        from .newsletter import Newsletter  # avoid circular import

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