Add test coverage for Threads, Facebook, Twitter, Bluesky, Pinterest read abilities

[chubes4]

Description

The feat/all-platform-read-operations PR adds read abilities for 5 platforms but lacks test coverage:

• ThreadsReadAbility — list posts, get single post, replies
• FacebookReadAbility — list posts, get single post, comments
• TwitterReadAbility — list tweets, get single tweet, mentions
• BlueskyReadAbility — list posts, get thread, profile
• PinterestReadAbility — list pins, get pin, boards, board pins

Requirements

Follow the pattern established by InstagramReadAbilityTest (PR #25):

1. Mock HTTP requests via pre_http_request filter
2. Mock auth providers via datamachine_auth_providers filter
3. Test all ability methods: list(), get(), platform-specific methods (replies, comments, mentions, etc.)
4. Test error cases: auth failures, API errors, invalid IDs
5. Run tests: homeboy test data-machine-socials

Related

• PR feat: add read operations for all remaining platforms #27: feat: add read operations for all remaining platforms
• PR feat: Instagram read operations — ability, CLI, chat tool, REST API #25: feat: add Instagram read operations (has tests)