docs(archive): Batch archive of 20 PRs

[AceHack]

Automated batch archival of 20 PRs to preserve discussion and context, and to reduce PR queue noise.

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[Copilot]

Pull request overview

This PR archives 20 merged PRs as verbatim conversation records under docs/pr-discussions/, preserving discussion context and reducing PR queue noise. Each new file is a self-contained markdown archive with YAML frontmatter (pr_number, title, author, state, timestamps, refs, archive metadata) followed by the original PR description, reviews, threads, and general comments.

Changes:

• Adds 20 new PR archive markdown files under docs/pr-discussions/ for PRs #5404–#5425.
• Each archive uses consistent frontmatter via tools/pr-preservation/archive-pr.ts and preserves verbatim PR content.
• Path is markdownlint-ignored per existing config, allowing verbatim preservation of PR markdown.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/pr-discussions/PR-5425-*.md	Archive of PR #5425 (B-0852.2b persist/restore CLIs rebased)
docs/pr-discussions/PR-5424-*.md	Archive of PR #5424 (B-0857 Turns 4/5/6 framing)
docs/pr-discussions/PR-5423-*.md	Archive of PR #5423 (B-0857 install.sh universal entry)
docs/pr-discussions/PR-5421-*.md	Archive of PR #5421 (B-0852.2a envelope serializer)
docs/pr-discussions/PR-5420-*.md	Archive of PR #5420 (B-0854.1 install state-machine inventory)
docs/pr-discussions/PR-5419-*.md	Archive of PR #5419 (B-0853.1 cosign security tightenings)
docs/pr-discussions/PR-5418-*.md	Archive of PR #5418 (B-0852.10 per-cred type handlers)
docs/pr-discussions/PR-5417-*.md	Archive of PR #5417 (B-0853.1 cosign keyless OIDC)
docs/pr-discussions/PR-5416-*.md	Archive of PR #5416 (B-0855.1 self-register NixOS module)
docs/pr-discussions/PR-5415-*.md	Archive of PR #5415 (B-0852 phase-split auth-method)
docs/pr-discussions/PR-5414-*.md	Archive of PR #5414 (B-0852.5 cred-manifest schema)
docs/pr-discussions/PR-5413-*.md	Archive of PR #5413 (B-0856 Path A coordination standard)
docs/pr-discussions/PR-5412-*.md	Archive of PR #5412 (B-0855 self-registration architecture)
docs/pr-discussions/PR-5411-*.md	Archive of PR #5411 (B-0852.1 crypto module)
docs/pr-discussions/PR-5410-*.md	Archive of PR #5410 (P0 nixos-install --fallback fix)
docs/pr-discussions/PR-5409-*.md	Archive of PR #5409 (Addison hardware inventory draft)
docs/pr-discussions/PR-5407-*.md	Archive of PR #5407 (bash-retirement category metadata check)
docs/pr-discussions/PR-5406-*.md	Archive of PR #5406 (hygiene tick 0608Z dotgit-saturation closed)
docs/pr-discussions/PR-5405-*.md	Archive of PR #5405 (B-0854 Ace install migration trajectory)
docs/pr-discussions/PR-5404-*.md	Archive of PR #5404 (B-0853 sigstore artifact signing)

These are mechanically-generated PR conversation archives under docs/pr-discussions/**, a closed-list history surface (per coding guidelines, name attribution and verbatim content are preserved by design). Markdownlint is configured to ignore this path. The archive tool's frontmatter schema matches the stored memory. No code or behavior changes.