Backfill CHANGELOG through v0.4.0 and align all version references

[koko1123]

What

Brings the CHANGELOG and every version reference in the repo up to date, preparing the v0.4.0 release.

Why

CHANGELOG.md only documented v0.1.0 even though v0.2.0–v0.3.0 are tagged and released, build.zig.zon said 0.3.0, the README and docs told users to install #v0.2.2, and SECURITY.md claimed only 0.1.x is supported. Inconsistent versioning is one of the first things prospective adopters notice.

How

• Backfilled Keep-a-Changelog entries for 0.2.0, 0.2.1, 0.2.2, 0.2.3, and 0.3.0 from the tagged commit history
• Added the 0.4.0 entry: WsClient auto-reconnect (Add WsClient: resilient WebSocket subscriptions with auto-reconnect #51), eth_call state overrides (Add eth_call state overrides (closes #12) #54), full pending-tx subscriptions (Add full pending-transaction subscription support (closes #14) #53), SSE transport (Add SSE transport + Built with eth.zig section #48), typed subscriptions (Typed subscription event parsing (nextBlock, nextLog) #43), retry middleware (Provider middleware: retry with exponential backoff #41), batch eth_call + DEX math (Add batch eth_call + pure Zig DEX math (V2/V3/Router) #42), security fixes (Fix 21 security, correctness, and code quality issues #44), Zig-master @Splat migration (Replace removed ** array-repetition operator with @splat (fixes Zig master CI) #56)
• build.zig.zon 0.3.0 → 0.4.0; README/docs install URLs → #v0.4.0; SECURITY.md supported versions → 0.4.x

After merge I'll tag v0.4.0 and publish the GitHub release with these notes.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • WebSocket and SSE transport options added
  • Subscription enhancements with typed parameters and lifecycle management
  • RpcTransaction parsing and eth_call overrides support
  • Retry middleware and BatchCaller utility
  • Zig DEX math scaffolding and Makefile automation

• Documentation

  • Installation guides and security policy updated for v0.4.0 compatibility

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Project	Deployment	Actions	Updated (UTC)
eth-zig	Ready	Preview, Comment	Jun 10, 2026 1:40am

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bea11d9e-b412-49c5-9b6c-c203e6977620

📥 Commits

Reviewing files that changed from the base of the PR and between 6b57f35 and 32d6841.

📒 Files selected for processing (5)

• CHANGELOG.md
• README.md
• SECURITY.md
• build.zig.zon
• docs/content/docs/installation.mdx

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📝 Walkthrough

Walkthrough

This pull request bumps eth.zig to version 0.4.0. The package manifest version is updated, a new changelog section documents added features (WebSocket and subscription improvements, eth_call overrides, new transports), breaking changes (Zig syntax, stricter validation), and bug fixes. Installation and compatibility documentation are updated to reference the new version and specify 0.4.x support.

Changes

Version 0.4.0 Release

Layer / File(s)	Summary
Version manifest bump build.zig.zon	Version field updated to 0.4.0.
Release changelog CHANGELOG.md	New 0.4.0 entry documents added features (resilient WebSocket client, full pending-transaction subscriptions, RpcTransaction parsing, eth_call overrides, SSE transport, typed subscription params/lifecycle, retry middleware, BatchCaller, Zig DEX scaffolding, Makefile automation), breaking changes (Zig splat syntax, stricter transaction field handling), and corresponding bug fixes and security audit items. Prior releases retained.
Installation and compatibility documentation README.md, SECURITY.md, docs/content/docs/installation.mdx	Installation instructions updated to reference eth.zig v0.4.0. Supported versions table updated to reflect 0.4.x support with versions below 0.4 marked as unsupported.

🎯 1 (Trivial) | ⏱️ ~3 minutes

🐰 A version hop, from three to four,
With docs and manifest in accord,
Release notes flow like streams so clear,
Installation paths bright and dear,
Support for point-four, forevermore! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and clearly summarizes the main change: backfilling CHANGELOG through v0.4.0 and aligning version references across all documentation and metadata files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/changelog-and-v0.4.0

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