chore: prepare pishoo v0.8.0-beta.2

[eareimu]

Release prep

Prepare pishoo v0.8.0-beta.2 with the identity access-rule database fix, refreshed Linux packaging toolchain, and beta.2 DHTTP stack dependency contracts.

Draft tag message

# pishoo v0.8.0-beta.2

## Changes

- Load identity access rules from the identity profile access-rule database.
- Refresh Linux packaging Zig/cargo-zigbuild tooling for DEB/RPM builds.
- Update DHTTP stack dependency contracts for the beta.2 line.

## Published packages

- `gateway` v0.8.0-beta.2
- `pishoo` v0.8.0-beta.2
- `pishoo-common` v0.5.1-1

Release gates

• Target branch: master
• Planned tag: v0.8.0-beta.2
• Initial/incremental: incremental
• Surfaces: S3/R2 product packages for DEB, RPM, and 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 package release readiness.