docs(appendix): timeless gaps page, drop PR pointer

[JarbasAl]

Editorial polish of appendix §7 (known gaps) for timeless,
standalone reading:

• Remove the "AI-generated draft / not yet fully reviewed" provenance
  banner (the page header already carries a "Non-normative" notice).
• Retitle "Known gaps and planned work" -> "Known gaps".
• Remove the in-flight PR pointer "(in flight at PR OVOS-SESSION-2: Session Lifecycle and State Ownership (draft) #27)" and the
  temporal words "not yet claimed", "current OVOS already carries",
  "do not currently have".
• Reword "deferred to a future X specification" / "a future revision"
  to the timeless "separate X specification" / "a revision".

Non-normative companion content only; the gap list is unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d6ead9bb-5b8e-4022-b6ac-c1a887e793bb

📥 Commits

Reviewing files that changed from the base of the PR and between 2033980 and db5a259.

📒 Files selected for processing (1)

• appendix/gaps.md

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch docs/polish-gaps

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