feat: support stdin formatting for Zed

[somedayiamold]

Summary by CodeRabbit

• New Features
  • Format Go source provided through standard input and write the formatted result to standard output when no file or directory is specified. You can also explicitly use - to provide input through standard input.
• Documentation
  • Added instructions for configuring goimports-reviser -format as a Zed external formatter.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 7134a699-1972-498d-aad6-747a4e02f58c

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📥 Commits

Reviewing files that changed from the base of the PR and between d9b1304 and 1960fea.

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📒 Files selected for processing (3)

• README.md
• main.go
• main_test.go

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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The CLI now reads Go source from standard input when no path is supplied or when the sole path is -. It writes formatted source to standard output. The README documents these invocation forms and Zed formatter setup.

Changes

Standard input formatting

Layer / File(s)	Summary
Normalize, format, and document stdin input main.go, main_test.go, README.md	Empty path lists and a sole - are normalized to the standard-input sentinel. Tests check path normalization and exact formatted stdout. The README describes stdin usage and Zed configuration.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

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Merge Risk: ⚪ Minimal · up to 1960f

No actionable merge-blocking issue is established. The explicit dash invocation has less test coverage than the no-path invocation.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: adding stdin formatting support for Zed.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files. (1 skipped: 1 unsupported.)

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