Promote dev to main

[alexphillips-dev]

Summary

• remove beta release channel support
• include current validated dev fixes now queued on dev

Validation

• pre-push suite passed on dev
• [x]
  ode --test tests/versioning-guard.test.mjs
• branch-model / release guards updated for main+dev only

Notes

• This promotion intentionally removes the beta channel and its workflows/templates.
• Local uncommitted UI work is not part of this PR; the PR is based on remote dev.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Point stable manifest back to main channel URLs

This commit promotes dev into main, but the manifest now hard-codes the dev branch for update/download URLs. On main, this makes stable installs fetch packages from dev (including the archive URL later in the same file), and it also causes scripts/release_guard.sh to fail whenever FVPLUS_EXPECT_PLUGIN_BRANCH/GITHUB_REF_NAME resolves to main (the CI/release-on-main path). Please keep main manifests on main URLs and reserve dev URLs for dev-branch artifacts only.

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