Sync roadmap and backlog with CI-built plugins

[tonythethompson]

Update docs backlog and roadmap to reflect the current CI-built plugin registry state, including DNS promoted status and corrected links.

[linear-code]

NUM-90

[coderabbitai]

🔗 Related PRs

#13 - Wave 2 research notes; close Wave 1 plugins checklist [merged]
#42 - Mark wave2 plugins PROMOTED after registry publish [merged]
#45 - docs: note Windows lifecycle-prove for wave2 [merged]
#51 - docs: clarify backlog vs live catalog and default branch [merged]
#66 - docs: sync roadmap and backlog with live CI-built plugins [open]

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