fix: restrict RSS retries to transient failures

[IceCodeNew]

Summary

• retry RSS transport failures and explicit transient HTTP statuses only
• honor valid Retry-After delays without replacing the existing jitter floor
• document the retry contract and cover permanent errors, transport failures, and header parsing

Validation

• 19 focused RSS tests passed
• 553 full tests passed with branch coverage; total misses remain 15
• prek run --all-files passed
• CodeRabbit CLI review completed with no findings

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e62118bd-a16b-4a4a-9a2c-639f68f6a0a4

📥 Commits

Reviewing files that changed from the base of the PR and between 04fa7be and 82586be.

📒 Files selected for processing (4)

• docs/design.md
• docs/requirements.md
• tests/test_sources.py
• weather_briefing/sources.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/restrict-rss-retries

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.63%. Comparing base (04fa7be) to head (82586be).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   99.62%   99.63%           
=======================================
  Files          38       38           
  Lines        5944     6019   +75     
  Branches      323      327    +4     
=======================================
+ Hits         5922     5997   +75     
  Misses         15       15           
  Partials        7        7           

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