feat!: v3.0.0 — dynamic Ollama model selection and TanStack AI

[anjerodev]

Summary

Major release (3.0.0) modernizing Commitollama around live Ollama models, better commit quality, and CI/tooling updates.

• Replace preset model enum with dynamic Ollama model tags and a first-run quick pick (project or user settings)
• Add Commitollama: Switch Model command in Source Control and the Command Palette
• Migrate commit generation to TanStack AI structured outputs with Zod validation
• Add security hardening (endpoint/header validation, untrusted diff wrapping, redacted errors)
• Improve summarization, staged-diff handling, commit quality checks, and error messages
• Migrate package management from npm to pnpm and update GitHub Actions workflows accordingly
• Update README for the new model workflow and known model compatibility limits

Breaking changes

• Removed commitollama.model enum presets (Llama, Custom, etc.) — use Ollama tags like llama3.2:latest
• Removed commitollama.custom.model
• Removed commitollama.runOllamaPull command

Version

3.0.0 (major) — breaking configuration and command changes.

Release workflow

Per .github/workflows/release.yml:

1. Review and merge this PR without the Release label to land changes on main
2. When ready to publish to the Marketplace, either:
   • Open a follow-up version PR via Actions → Version Bump (not needed — version is already 3.0.0), or
   • Add the Release label to this PR before merging to trigger packaging, GitHub release, and VS Code Marketplace publish on merge

Test plan

• pnpm install --frozen-lockfile
• pnpm run build
• pnpm test (41 passing)
• Manual: first-run model picker + storage target selection
• Manual: switch model from SCM toolbar
• Manual: generate commit message from staged changes
• Manual: verify CI passes on this PR

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