chore(release): cut v0.4.0

[TinDang97]

Release v0.4.0

First ADD-recorded release. Bundles 5 closed milestones since v0.3.0.

Milestones

Milestone	Highlights
v1-shared-nothing	shardslice-migration (cross-shard read fast-path)
v2-performance	xshard read fast-path, WAL group-commit, FT.SEARCH off-event-loop
v2-1-throughput-polish	cost-free monoio FT.SEARCH yield
v3-1-fts-hardening	working FTS combinators (OR / TEXT+TAG / NUMERIC), true total-matched counts, O(M²) high-DF cliff gone, ~40× faster indexing
v3-2-graph-correctness	Cypher inline-property narrowing, incoming-edge traversal after compaction, >32 graph labels

Changes in this commit

• CHANGELOG.md — ## [0.4.0] section (rich per-change notes) + risk-accepted disclosure.
• RELEASES.md — append-only ADD ledger row (5 milestones · waiver · evidence).
• Cargo.toml / Cargo.lock — 0.3.0 → 0.4.0.

Readiness floor

• ✅ Full CI matrix green on moon-dev: fmt · clippy default + tokio · test --release · test tokio (225 ok, 0 failures, MOON_BIN-pinned Linux ELF).
• ✅ 0 security HARD-STOP.
• ⚠️ Risk-accepted, disclosed: cross-shard read fast-path removed (PR feat(shard): ShardSlice Phase 4 — shared-nothing storage live, lock wrappers deleted #175). Follow-up cross-shard-read-acceleration tracked to land before 2026-08-01. No correctness impact (consistency 197/197 across 1/4/12 shards, both runtimes).

After merge (human ship act)

git tag v0.4.0 → push tag → release-asset build/publish.

Summary by CodeRabbit

• Chores
  • Released version 0.4.0 with documented milestones.
  • Updated release notes with a risk-accepted change affecting cross-shard read performance; formal waiver and mitigation tracking included.

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[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: 9023ad22-ee09-49d6-b69a-d73a090379be

📥 Commits

Reviewing files that changed from the base of the PR and between e5a604c and dd75866.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (3)

• CHANGELOG.md
• Cargo.toml
• RELEASES.md

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📝 Walkthrough

Walkthrough

Bumps the Cargo package version from 0.3.0 to 0.4.0, adds a corresponding [0.4.0] section to CHANGELOG.md (with milestone bullets and a "Risk-accepted" subsection for the cross-shard read fast-path removal), and creates a new RELEASES.md file with the v0.4.0 entry.

Changes

v0.4.0 Release Bump and Documentation

Layer / File(s)	Summary
Version bump and release notes Cargo.toml, CHANGELOG.md, RELEASES.md	Cargo.toml version incremented to 0.4.0; CHANGELOG.md gains a [0.4.0] section with milestone bullets and a "Risk-accepted" subsection documenting cross-shard read fast-path removal, signed waiver, and follow-up tracking; RELEASES.md is created with a v0.4.0 entry referencing milestones, waiver, evidence, and CHANGELOG [Unreleased].

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• pilotspace/moon#155: Also a version bump updating Cargo.toml and CHANGELOG.md for a new release.
• pilotspace/moon#171: Directly preceding release bump to 0.3.0 with the same pattern of Cargo.toml version field and CHANGELOG.md entry updates.

Poem

🐇 Hop, hop, hooray, it's version four-oh!
The changelog grows longer, the crates start to glow,
A waiver was signed for the fast-path we dropped,
The shards read more slowly, but worries have stopped.
Release notes are fresh and the version is bright —
This bunny stamps 0.4.0 with delight! 🌕

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: creating a v0.4.0 release with version bumps and release documentation.
Description check	✅ Passed	The description provides comprehensive release context covering milestones, changes, and readiness status, though it does not follow the template structure (Summary, Checklist, Performance Impact, Notes sections are not used).
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.4.0

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