Fix AgencyZero release build and bump 0.8.51

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Summary

• align AgencyZero direct Blitz DOM and script dependencies with the 0.4 family required by tauri-runtime-blitz 0.3.2
• align the standalone Blitz preview to the same family
• keep all dependency declarations as caret ranges
• bump AgencyZero to 0.8.51 so the release is unambiguous and guaranteed to trigger

Root cause

A fresh lockless release resolved direct ps-blitz-script ^0.3 to 0.3.6 while tauri-runtime-blitz brought 0.4.2. Rust then saw two incompatible ScriptDocument types.

Validation

• clean graph contains one ps-blitz-dom and one ps-blitz-script, both 0.4.2
• cargo pkgid -p az-gui reports 0.8.51 after a fresh lockfile generation
• cargo check -p az-gui --features blitz-inspector
• cargo test -p az-gui --features blitz-inspector --no-run
• cargo fmt --all -- --check
• cargo fmt --manifest-path apps/blitz-preview/Cargo.toml -- --check
• cargo clippy --manifest-path apps/blitz-preview/Cargo.toml --all-targets -- -D warnings

The fresh-worktree GUI checks reused the existing generated frontend dist and sidecar binaries; they did not install or launch anything.

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Additional local release validation on the PR head (6b2a3ba):

• built the Stable-profile release bundle with cargo tauri build --features blitz-inspector, CARGO_PROFILE_RELEASE_STRIP=false, and line-table debug info
• bundle reports 0.8.51; codesign --verify --deep --strict passes; ad-hoc signature is intact; main executable retains 14,248 external symbols
• build resolved WorkTable 1.0.0-beta.19, WorkTablesIndex 0.0.12, arctic-wt 0.1.9, congee-wt 0.4.4, and the unified Blitz 0.4.2 family
• updater archive was produced; local updater signing then stopped as expected because TAURI_SIGNING_PRIVATE_KEY exists only in Actions
• all 18 wt-migrate tests pass
• both strict-load rejection/rebuild tests pass
• restored the committed 29 MB QA profile and rebuilt all 17 WorkTable directories successfully: 27,334 rows total, including 5,635 usage-ledger rows, 5,335 cache rows, 5,180 sessions, 4,810 task-log rows, and 2,212 messages

Local test app (not installed or launched): /Users/revenge/code/agencyzero/target/release/bundle/macos/AgencyZero.app.

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Experimental bundle validation is also complete. cargo tauri build --features experimental,blitz-inspector --config tauri.experimental.conf.json produced AgencyZero Experimental.app; it reports bundle id com.pathscale.agencyzero.experimental, version 0.8.51, passes deep/strict code-sign verification, is ad-hoc signed as intended, and retains 14,275 external symbols. As with Stable, only local updater signing stopped for the expected missing private key. The test bundle is at /Users/revenge/code/agencyzero/target/release/bundle/macos/AgencyZero Experimental.app; it was not installed or launched.

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Correction to the aggregate in my preceding validation comment: the listed per-table counts sum to 27,314 rows, not 27,334. The per-table output and all pass/fail results are unchanged.

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Closing in favor of #211. The release-resolution work is superseded there. The remaining preview-only diff mixes ps-blitz 0.4 types with tauri-runtime-blitz 0.3 and is not safe to fold.