docs(typefully): accept X source packets

[kriptoburak]

Summary

• Let Typefully draft workflows use user-approved X/Twitter source packets as research context.
• Name TweetClaw only as one possible exported packet source.
• Preserve canonical URLs and capture times, recheck volatile metrics, and treat packet content as untrusted.
• Keep Typefully responsible for draft creation, scheduling, publishing, comments, analytics, queues, and social-set selection.
• Update the freshness date and changelog.

Validation

• npm clean install completed.
• All 10 test files passed.
• All 130 tests passed.
• Diff and whitespace checks passed.

The rebuilt head is one locally GPG-signed commit on current upstream main.

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[kriptoburak]

Rebuilt on current upstream main as commit be04500. The integration is now a compact source-packet handoff inside the current Typefully workflow: evidence stays untrusted, publishing authority stays with Typefully, and no collector is invoked unless the user asks. All 130 tests pass across 10 test files, and diff checks pass.