Record the Windows beta9 preview candidate

[coneilen]

Summary

Record the immutable, unpublished Windows beta9 preview candidate and its
LFS-aware Dev Box handoff. Beta8 is failed/superseded by its Dev Box run, which
found unreadable terminal output and a Stop path that could target the wrong
zmx session. #635 fixes both. All runtime qualification gates remain open.

Changes

• Record source/tag/package/payload/executable/provider/toolchain identities for
  0.1.78-windows.beta9 at 399ae42dd08bac31408c925d09863b1a40f3755e.
• Record the Fix Windows terminal rendering and ownership #635 fixes and the passing local full Windows-shell validation at
  the candidate source.
• Record source-custody verification and the file-only offline restore with
  43/43 LFS files materialized, plus the 8/8 handoff inventory.
• Move beta8 to history as failed/superseded and immutable. Keep beta1 through
  beta7 unchanged.
• Keep Exact artifact complete, the other six gates open, and parity at
  98/62/36.

Test plan

RED: PR 635 TerminalSurface.zig --test-filter "real glyph snapshots" before the fix -> 1/1 executed; expected .snapshot, found .cells
GREEN: Tools\windows\validate.ps1 -Task windows-shell -SkipTrayLive -ShellValidationRoot C:\v7 at 399ae42 -> VALIDATE_EXIT=0; 54/54 sections; App 747/747; scrubbed 5/5; real daemon round trip PASS; UIA live gate PASS
REGRESSION: Tools\windows\release.ps1 -Tag 0.1.78-windows.beta9 -> repository verify 1 PASS; extracted setup verify 1 PASS; payload 50; binary reports deferred; packaged scrubbed startup 5/5

• Source custody Create and Verify passed with 43 objects for 43 files.
• File-only offline restore through the included Restore-GraphCodeSource.ps1
  gave exact detached HEAD/tag, zero remotes, clean status, and 43/43
  materialized LFS files.
• Handoff inventory: 8/8 hashes verified; hashes.sha256 SHA-256
  bd57e1e11c02fb3bc4644c8faf91137bf4e9272c2c01f8dbd0f629af9a108dce.
• Not claimed: human-observed terminal readability on a native client, Dev Box,
  backend, destructive fixture, Worktrees, Nod, dump, or publication evidence.
• No tag or release was pushed or published.
• macOS make test and make check were not run because this is a
  documentation-only Windows candidate evidence update.

Checklist

• I have read the Contributing Guidelines
• I have signed off my commits (git commit -s) per the DCO
• Tests pass locally (make test)
• Code follows the existing style (make check)
• I added the test/contract before the implementation and observed the intended RED failure