chore: prepare gmutils v0.8.0-beta.2

[eareimu]

Release prep

Prepare gmutils v0.8.0-beta.2 with curl verbose/redirect/upload improvements, identity QR/device-name changes, SSH primary sequence selection, refreshed Linux packaging toolchain, and beta.2 DHTTP stack dependency contracts.

Draft tag message

# gmutils v0.8.0-beta.2

## Changes

- Add HTTP/3 verbose metadata, redirect/upload verbose output, progress coordination, streamed response handling, and `--fail` flag clusters to `genmeta curl`.
- Reject unsupported redirect schemes and invalid redirect locations in `genmeta curl`.
- Preserve verbose markers while decoding and send headers before upload bodies.
- Show QR checkout codes and enrich generated device names in `genmeta identity`.
- Choose the SSH primary sequence before connecting in `genmeta ssh`.
- Refresh Linux packaging Zig/cargo-zigbuild tooling for DEB/RPM builds.
- Update DHTTP stack dependency contracts for the beta.2 line.

## Published crates and packages

- `genmeta` v0.8.0-beta.2
- `genmeta-curl` v0.7.0-beta.2
- `genmeta-ssh` v0.7.0-beta.2
- `genmeta-identity` v0.4.0-beta.2

Unchanged gmutils workspace crates remain on their existing published versions.

Release gates

• Target branch: main
• Planned tag: v0.8.0-beta.2
• Initial/incremental: incremental
• Surfaces: crates.io workspace crates, S3/R2 product packages for DEB/RPM/Scoop/Homebrew, tag-CI GitHub Release

Dependency wait conditions

dhttp v0.5.0-beta.2 and dshell v0.6.0-beta.2 are published and visible on crates.io before final crates.io/package release readiness.