docs: document Gmail web link vs API ID mismatch (#858)

[MeGaurav4]

Documents the mismatch between Gmail API hex IDs and web-based URLs. The API returns hex thread/message IDs but there is no supported way to convert them into stable Gmail web URLs.

Only README.md and skills/gws-gmail/SKILL.md are changed.

Closes #858

Verification

• The docs explicitly state that #all/<hexId> is unofficial and unreliable
• The notes clarify why direct permalinks from API IDs are not supported

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the project documentation by addressing common confusion regarding Gmail identifier mapping. It clarifies that there is no direct, supported way to convert Gmail API hex IDs into permanent web permalinks, helping users avoid reliance on unofficial URL patterns.

Highlights

• Documentation Update: Added clarifying notes regarding the mismatch between Gmail API hex IDs and web-based URLs to both the main README and the Gmail skill documentation.
• Technical Guidance: Explicitly warned users that '#all/' is an unreliable method for linking and suggested using '#search/rfc822msgid:' as a more stable alternative.

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[gemini-code-assist]

Code Review

This pull request updates README.md and skills/gws-gmail/SKILL.md to add a note explaining the differences and limitations between Gmail web links and API IDs, specifically highlighting that there is no official way to convert API hex IDs into durable web URLs. I have no feedback to provide as there are no review comments or issues identified in these documentation updates.