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Spec Kit 0.5.1: Git Extension & Dependency Fixes

Spec Kit 0.5.1 bundles Git extension with stage 2 improvements, fixes critical import crash, and adds 7 new community extensions to the catalog.

TL;DR

Git extension now bundled with hooks on all core commands, plus stage 2 improvements (branch override, force flag, auto-install tests)
Fixed critical import crash from typer/click version pins
New community extensions added: Spec Diagram, Branch Convention, Spec Refine, canon, Confluence

Git extension stage 2 — GIT_BRANCH_NAME override, --force flag for existing directories, auto-install tests for better workflow control
specify integration subcommand — manage post-init integrations without reinitializing
Argument-hint frontmatter for Claude Code — improved command hints for AI-assisted workflows
VS Code Ask Questions preset — new community preset for IDE integration
Forgecode agent support — added to extension ecosystem
Fleet extension v1.1.0 — updated with latest features
Community extensions catalog — Spec Diagram, Branch Convention, Spec Refine, canon, Confluence, optimize, security-review v1.1.1

Import crash — pinned typer>=0.24.0 and click>=8.2.1 to resolve dependency conflicts
Git checkout errors — now surface errors for existing branches properly
Forge frontmatter — use hyphen notation in name field
Bash portability — sed replacement escaping and BSD compatibility in update-agent-context.sh
TOML closing quotes — prevent ambiguous quotes when body ends with double quote
Community extension aliases — restored compatibility
YAML frontmatter in TOML — strip from integration prompts
Multiline descriptions — serialize correctly in legacy TOML renderer
Spec number validation — accept 4+ digit spec numbers in tests and docs
Git branch creation errors — improved error handling in scripts
Stale workflow permissions — added actions:write permission
Claude user-invocable — fixed for skill frontmatter