Add public logging formatters

[backslash-f]

Summary

• add public Date.formattedLogTimestamp() and TimeInterval.formattedLogDuration() helpers under Sources/Extensions
• move duration and date formatter coverage into AppLogger tests
• add a DocC catalog under Documentation/AppLogger.docc
• add the Swift-DocC plugin dependency and GitHub Pages build_docs/deploy_docs release jobs
• replace duplicated API sections in the README with DocC links and add a deployed-documentation badge
• update embedded shared Agent Guidelines to released 0.0.5

The Deutsch consumer update is prepared locally and will be finalized after AppLogger 1.1.0 is released.

Verification

• swift test
• swift package generate-documentation --target AppLogger --disable-indexing --transform-for-static-hosting
• python3 AgentGuidelines/Scripts/validate_guidelines.py

AppLogger will be released only after this PR is approved and merged.

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