feat: implement all v0.1.x open issues (#14-#21)

[ajianaz]

Closes #14, #15, #16, #17, #18, #19, #20, #21

Summary

All 8 open issues from the v0.1.x milestone implemented in one batch:

#	Issue	Implementation
#14	Shell completion	cora completion bash/zsh/fish/powershell via clap_complete
#15	Homebrew tap	Release workflow auto-updates ajianaz/homebrew-cora formula
#16	Streaming responses	cora review --stream with SSE parsing via futures-util
#17	GitHub Actions	CI workflow (fmt + clippy + test) + multi-platform release
#18	Tests	151 tests: unit + integration
#19	Incremental scan	cora scan --incremental with content hash cache
#20	Multi-provider detect	cora providers + auto-detection (OpenAI/Anthropic/Groq/Ollama/ZAI)
#21	SARIF upload	cora upload-sarif + cora review --upload to GitHub Code Scanning

Stats

• +2970 lines across 31 files
• 151 tests passing
• Zero warnings

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8afba055-ef78-441d-b5d1-86f25af6034f

📥 Commits

Reviewing files that changed from the base of the PR and between a9293a6 and 0226293.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (30)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• Cargo.toml
• src/commands/auth.rs
• src/commands/completion.rs
• src/commands/hook_cmd.rs
• src/commands/mod.rs
• src/commands/providers.rs
• src/commands/review.rs
• src/commands/scan.rs
• src/commands/upload.rs
• src/config/loader.rs
• src/config/mod.rs
• src/config/providers.rs
• src/config/schema.rs
• src/engine/llm.rs
• src/engine/review.rs
• src/engine/scanner.rs
• src/engine/types.rs
• src/formatters/compact.rs
• src/formatters/json_fmt.rs
• src/formatters/mod.rs
• src/formatters/pretty.rs
• src/formatters/sarif.rs
• src/git/diff.rs
• src/git/files.rs
• src/hook/install.rs
• src/main.rs
• tests/cli_basic.rs
• tests/config_loading.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/all-open-issues

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