Add include-category and exclude-category options for feed filtering

[Copilot]

• Add include-category and exclude-category options
• Add tests for category filtering
• Update config documentation
• Fix CI test failures:
  • Changed MkdirAll mode from 0666 to 0755 (directories need execute permission)
  • Added setupTestHome() helper to use t.TempDir() for isolated test environments

Original prompt

An RSS feed I use has a on each : https://www.avclub.com/rss.xml
Add per-feed key-value options include-category and exclude-category that match on a regular expression and include/exclude the post.

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[UberKitten]

@copilot so I can put two include-category and both will work? do other options also allow this?

[Copilot]

@copilot so I can put two include-category and both will work? do other options also allow this?

Yes, multiple include-category options work together (OR'd - matching any one is sufficient to include the item). This follows the same pattern as existing options like include, include-title, exclude, and exclude-title.

The config documentation (lines 89-90 of config_cmd.go) already notes: "configuration-keys may be repeated multiple times, if you desire."

Example:

https://www.avclub.com/rss.xml
 - include-category: (?i)movies
 - include-category: (?i)tv

This includes items categorized as either "movies" OR "tv".

[UberKitten]

@copilot fix relevant test failures

[Copilot]

@copilot fix relevant test failures

Fixed in dc12c64. The issues were:

1. os.MkdirAll used mode 0666 instead of 0755 (directories need execute permission to be traversed)
2. Added setupTestHome(t) helper using t.TempDir() to isolate tests from the system HOME directory