Refactor Reddit fetches onto core fresh candidates

[chubes4]

Summary

• Refactors pipeline-driven Reddit fetches to use Data Machine core FreshCandidateCollector for selection-time processed/claimed/reprocess eligibility.
• Removes the old Reddit processed_items ability handoff and direct CLI/chat compatibility fallbacks.
• Adds focused coverage for processed top-of-feed results and pagination to later fresh candidates.

Fixes #135.

Tests

• php -l inc/Handlers/Reddit/Reddit.php && php -l inc/Abilities/Reddit/FetchRedditAbility.php && php -l inc/Cli/Commands/RedditCommand.php && php -l inc/Chat/Tools/FetchReddit.php && php -l tests/Unit/Abilities/Reddit/FetchRedditAbilityTest.php
• homeboy lint --path /Users/chubes/Developer/data-machine-socials@refactor-core-candidate-collector --changed-only --errors-only --summary
• homeboy lint --path /Users/chubes/Developer/data-machine-socials@refactor-core-candidate-collector --file tests/Unit/Abilities/Reddit/FetchRedditAbilityTest.php --errors-only --summary
• homeboy test --path /Users/chubes/Developer/data-machine-socials@refactor-core-candidate-collector -- tests/Unit/Abilities/Reddit/FetchRedditAbilityTest.php — 2 passed, 0 failed
• npm run build

Caveats

• Full repo lint still reports unrelated pre-existing findings outside this change; changed runtime PHP and new test lint pass.
• Test run emitted a non-fatal Action Scheduler bootstrap notice.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (openai/gpt-5.5)
• Used for: Refactoring Reddit candidate selection onto the Data Machine core fresh-candidate primitive and updating tests. Chris remains responsible for review and merge.

[homeboy-ci]

Homeboy Results — data-machine-socials

Audit

✅ audit — passed

• parallel-implementation — 26 finding(s)
• test_coverage — 18 finding(s)
• dead_code — 5 finding(s)
• intra-method-duplication — 4 finding(s)
• repeated_literal_shape — 2 finding(s)
• Total: 55 finding(s)

Deep dive: homeboy audit data-machine-socials --changed-since aca2263

Tooling versions

• Homeboy CLI: homeboy 0.157.1+a5b426802
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 9290561
• Action: Extra-Chill/homeboy-action@v2