fix: use per-package tags in release-plz

[infiniteregrets]

Summary

Using a shared tag v{{ version }} caused release-plz to skip publishing packages because it assumed all packages were already released when the tag existed.

Switch to per-package tags {{ package }}-v{{ version }} so each package has its own release tag (e.g., s2-cli-v0.26.0, s2-api-v0.26.0).

Test plan

• Merge and re-trigger release workflow

🤖 Generated with Claude Code

[greptile-apps]

Greptile Overview

Greptile Summary

Changed release-plz git tag format from shared v{{ version }} to per-package {{ package }}-v{{ version }} to fix a critical issue where release-plz would skip publishing individual packages after any package created the shared version tag.

This workspace contains 4 packages (s2-api, s2-lite, s2-cli, s2-common) that can have independent version updates. The previous shared tag format meant that once any package was tagged with v0.26.0, release-plz would incorrectly assume all packages were at that version and skip subsequent publishes. The new per-package format (e.g., s2-api-v0.26.0, s2-lite-v0.26.0) allows each package to be tracked and released independently.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Single-line configuration change that correctly fixes a documented release-plz issue with multi-package workspaces. The change follows release-plz best practices for monorepos and aligns with the PR description. No code logic affected.
• No files require special attention

Important Files Changed

Filename	Overview
release-plz.toml	Changed git tag format from shared v{{ version }} to per-package {{ package }}-v{{ version }} to enable independent package releases

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub Actions
    participant RP as release-plz
    participant Git as Git Repository
    
    Dev->>GH: Push to main branch
    GH->>RP: Trigger release-plz workflow
    
    Note over RP: Analyze workspace packages<br/>(s2-api, s2-lite, s2-cli, s2-common)
    
    RP->>Git: Check existing tags
    
    alt Old behavior (v{{ version }})
        Git-->>RP: Found tag v0.26.0
        Note over RP: Assumes ALL packages at v0.26.0<br/>Skips publishing individual packages
    end
    
    alt New behavior ({{ package }}-v{{ version }})
        Git-->>RP: Found tags:<br/>s2-api-v0.26.0<br/>s2-cli-v0.26.0<br/>Missing: s2-lite-v0.26.0
        Note over RP: Each package checked independently<br/>Can publish s2-lite even if others exist
        RP->>Git: Create tag s2-lite-v0.26.0
        RP->>GH: Publish s2-lite release
    end
    
    Note over RP,Git: Per-package tags enable<br/>independent release tracking

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