chore: clean .gitignore cache

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: prefer `GITHUB_TOKEN` while maintaining support for `CHARON_TOKEN` (fallback) where needed.
-- 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: `308ae5dd` (final body content before PR). Full ordered list in `docs/beta_release_draft_pr.md`.
-
-## Review Checklist
-
-- Secret `GITHUB_TOKEN` (or `CHARON_TOKEN` fallback) exists and has required scopes.
-- No lingering `GITHUB_TOKEN` or `CHARON_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).
-- Additional beta observability and import validation 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.