chore: add PR body content file for draft creation

docs/beta_release_pr_body.md

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+# Beta Release Draft Pull Request
+
+## Overview
+Draft PR to merge hardened CI/release workflow changes from `feature/beta-release` into `feature/alpha-completion`.
+
+## Highlights
+- Secret token migration: all workflows now use `PROJECT_TOKEN` (GitHub blocks new secrets containing `GITHUB`).
+- Release workflow refinements: stable prerelease detection (alpha/beta/rc), artifact matrix intact.
+- Prior infra hardening (already partially merged earlier): pinned GitHub Action SHAs/tags, resilient Delve (`dlv`) multi-arch build handling.
+- Extensive incremental documentation trail in `docs/beta_release_draft_pr.md` plus concise snapshot in `docs/beta_release_draft_pr_body_snapshot.md` for reviewers.
+
+## Ahead Commits (Representative)
+Most recent snapshot commit: `e2fc0b80` (final body refresh). Full ordered list in `docs/beta_release_draft_pr.md`.
+
+## Review Checklist
+- Secret `PROJECT_TOKEN` exists and has required scopes.
+- No lingering `GITHUB_TOKEN` references beyond allowed GitHub-provided contexts.
+- Artifact list (frontend dist, backend binaries, caddy binaries) still correct for release.
+
+## Risks & Mitigations
+- Secret rename: Mitigate by verifying secret presence before merge.
+- Workflow call path validity: `docker-publish.yml` referenced locally; CI on draft will validate end-to-end.
+
+## Deferred Items (Out of Scope Here)
+- Frontend test coverage improvements (ProxyHostForm).
+- Observability/import validation expansions for later beta tasks.
+
+## Actions After Approval
+1. Confirm CI draft run passes.
+2. Convert PR from draft to ready-for-review.
+3. Merge into `feature/alpha-completion`.
+
+## Request
+Please focus review on secret usage, workflow call integrity, and artifact correctness. Comment with any missed token references.
+
+---
+Generated programmatically to aid structured review.