fix: add CAMS pollen attribution

[IceCodeNew]

Summary

• Show context-document names in rendered citations while preserving the existing generic label for RSS article links.
• Attribute Open-Meteo pollen data to both Open-Meteo and CAMS ENSEMBLE in HTML and plain-text briefings.
• Document the attribution source and deterministic rendering behavior.

Why

The Open-Meteo Air Quality API states that pollen values are provided by the CAMS European Air Quality forecast and requires clear attribution to CAMS ENSEMBLE together with a reference to Open-Meteo.

• Open-Meteo Air Quality API: https://open-meteo.com/en/docs/air-quality-api
• CAMS ENSEMBLE documentation: https://confluence.ecmwf.int/spaces/CKB/pages/202173092/CAMS+Regional+European+air+quality+analysis+and+forecast+data+documentation

Validation

• 411 tests passed
• Local coverage: 99.67% lines, 98.18% branches
• All prek hooks passed
• Full diff manually reviewed

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a8f17a61-84e4-45c8-b6da-7d48f371d23c

📥 Commits

Reviewing files that changed from the base of the PR and between 57222ea and b8558de.

📒 Files selected for processing (6)

• README.md
• docs/design.md
• tests/test_render.py
• tests/test_weather_context.py
• weather_briefing/render.py
• weather_briefing/weather_context.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/cams-ensemble-attribution

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.46%. Comparing base (57222ea) to head (b8558de).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #25   +/-   ##
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  Coverage   99.46%   99.46%           
=======================================
  Files          38       38           
  Lines        5213     5224   +11     
  Branches      303      303           
=======================================
+ Hits         5185     5196   +11     
  Misses         17       17           
  Partials       11       11           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[Copilot]

Pull request overview

This PR updates pollen attribution to comply with Open-Meteo’s Air Quality API requirements by explicitly crediting CAMS ENSEMBLE, and improves citation rendering so context documents display their names while RSS article links keep the generic “来源” label.

Changes:

• Update Open-Meteo allergen source_name to include “CAMS ENSEMBLE” and assert it in context parsing tests.
• Render context document citations with the document name (HTML link text and plain-text name: url), while keeping RSS article citations as the generic “来源”.
• Document the attribution source and deterministic rendering behavior in README and design docs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
weather_briefing/weather_context.py	Updates Open-Meteo pollen/allergen snapshot attribution name to include CAMS ENSEMBLE.
weather_briefing/render.py	Changes citation rendering to show context document names (HTML + plain text) while preserving generic RSS labels.
tests/test_weather_context.py	Adds coverage asserting the updated allergen attribution name.
tests/test_render.py	Adds tests ensuring context document attribution is rendered deterministically in both renderers.
README.md	Documents pollen attribution to Open-Meteo and CAMS ENSEMBLE.
docs/design.md	Updates design documentation to reflect attribution requirements and rendering behavior.

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