chore: roll changelog and version references for v2.0.0

Andrew Dunnrequested to merge
release/v2-roll into main

What

Rolls the changelog for the v2.0.0 release and updates the two docs-site version references.

  • CHANGELOG.md: the Unreleased section becomes [2.0.0] - 2026-08-11, with new entries for the two user-visible changes merged today: the Influence Projects ego-view empty-state correction (!66 (merged)) and the seeder growth-pass compounding fixes with the decay model (!68 (merged)). Everything else in the section shipped to main in June and has waited unreleased since.
  • site/src/pages/reference/security.astro: supported-versions table moves to v2.0.0 (latest release) supported, v1.0.0 no longer supported.
  • site/src/pages/guides/airgapped.astro: the pin-a-tag examples move from manifold:v1.0.0 to manifold:v2.0.0.

Why a major bump

The release removes a public CLI flag (--domains) and makes collection fail loudly on a non-admin token where it previously succeeded with silently truncated data. Both are breaking under semantic versioning.

After merge

An annotated v2.0.0 tag on this MR's merge commit triggers the release pipeline (container build, sign, verify; binary; release page with asset links).

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