Preserve SubscriptionText TSV column positions

[id774]

Summary

• SubscriptionText TSV parsing preserves positional columns.
• Empty fields do not shift later values.
• Blank / all-empty rows produce no item.
• Extra columns remain ignored.
• The manual integration Recipe now has one files key.
• Existing SubscriptionText RSpec covers the corrected boundary.

Reason

• The documented TSV meaning is positional: column 0 is title, column 1 is
  url, and so on regardless of which fields are empty.
• line.strip destroyed leading tab information, so a URL-only row (title
  column empty) had its URL read into the title field instead of the link.
• The default split("\t") did not preserve trailing empty fields, so a row
  with empty trailing columns lost its column alignment.
• The duplicate files: key in test/integration/test_text2feed.yml made the
  manual integration configuration ambiguous (YAML silently uses only the
  last key).

Tests

All commands below were run in this environment (Ruby 3.3.6):

• bundle exec rspec spec/plugins/subscription/text_spec.rb — 17 examples, 0 failures
• bundle exec rake spec:plugins — 297 examples, 0 failures
• bundle exec rake spec:lib — 110 examples, 0 failures
• bundle exec rake spec — 416 examples, 0 failures
• Static validation of test/integration/test_text2feed.yml (single files
  key, resolves to the two expected TSV paths) — exit 0
• gem build automatic.gemspec — succeeded (automatic-26.09.gem)
• bundle exec ruby -Ilib -e "require 'automatic'" — exit 0
• bundle exec bin/automatic --version — exit 0, prints 26.09
• bundle exec bin/automatic --help — exit 0

Required CI (Ruby 3.3 / 3.4 / 4.0) status will be confirmed once the checks
run on this pull request.

Compatibility

• Recipe keys unchanged.
• Column order unchanged.
• UTF-8 handling unchanged.
• Fewer-than-five columns remain supported.
• Columns after the fifth remain ignored.
• titles / urls / feeds behavior unchanged.
• File read failure behavior unchanged.
• FeedMaker unchanged.
• No dependency changes.
• VERSION remains 26.09.
• Ruby support (3.3–4.0) unchanged.

Version History

Added one entry to the existing unreleased v26.09 section of doc/VERSIONS:

Preserve SubscriptionText TSV column positions and ignore empty input rows.

https://claude.ai/code/session_01CbtimCQAVdGhaEFXsEGKPK

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