Release 0.4.0

[shibayan]

What this changes

Release 0.4.0: bumps every package to 0.4.0 and finalizes the Unreleased changelog section as the 0.4.0 entry. Covers all PRs merged since v0.3.0: #81, #82, #83, #84, #85, #86, #87, #88, #89, #91, #93, #94.

Highlights, per package:

• core — ten breaking changes across the release settle types and the supported surface (ResponseBase.value is T | undefined, raw non-object JSON Schemas type input as unknown, MiddlewareKind removed, the request-assembly helpers move to /internal); GenAI message events move to the chat span with OTel v1.36.0 bodies (Emit GenAI message events only on the chat span, with v1.36.0 bodies #87); a streamed background suspension stores its exchange exactly once (Store a streamed background suspension's exchange exactly once #89); skills prompt guidance covers positional script arguments (Guide models to pass positional script arguments as a string array #88).
• foundry — credentials and endpoint centralize in the new FoundryProject handle (Centralize Foundry credentials and endpoint in a shared FoundryProject #91); FoundryTarget.modelDeployment → model.
• anthropic — thinking is a validated discriminated union; citations map to framework annotations.
• agentserver — request-body/retention/session bounds, serialized Invocations turns, TERMINAL_EVENT_TYPES unexported.
• Repository — shared config presets (Simplify framework structure and shared configuration #82), hardened release/CI workflows (Harden runtime safety, provider fidelity, and release workflows #81), dependency bumps (ci: bump the production-dependencies group with 2 updates #83–ci: bump @biomejs/biome from 2.5.8 to 2.5.9 in the development-dependencies group #86).

Version bump locations (the four kinds): packages/*/package.json (all packages), INSTRUMENTATION_VERSION (core/observability/version.ts), PACKAGE_VERSION (agentserver/config.ts), MCP_CLIENT_VERSION (mcp/connection.ts). Meta-package deps stay workspace:* (expanded to exact pins at publish). rg "0\.3\.0" packages/ returns no hits.

After merge: pushing the v0.4.0 tag triggers npm publish; the GitHub Release is created afterwards from the changelog entry.

Parity

• Reference checked: per constituent PR (this PR only bumps versions and finalizes the changelog).
• Wire format affected: no
• Public API affected: no (beyond the already-merged PRs this records)
• Breaking change: no (the entry documents the ten breaking changes already on master)

Checklist

• pnpm check passes (lint, typecheck, build, test)
• Behaviour changes are covered by a test that fails without the change (n/a — no behaviour change)
• Public API changes are reflected in the package README and CHANGELOG.md

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Prepares the repository for the v0.4.0 release by bumping all workspace package versions and updating the few in-code version constants that are required to stay in sync with their respective package.json versions, while finalizing the changelog entry for the release.

Changes:

• Bump all packages/*/package.json versions (and the meta package) from 0.3.0 → 0.4.0.
• Update version constants enforced by unit tests (INSTRUMENTATION_VERSION, MCP_CLIENT_VERSION, PACKAGE_VERSION) to 0.4.0.
• Promote the changelog’s prior “Unreleased” content into a ## 0.4.0 section.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/openai/package.json	Bumps OpenAI package version to 0.4.0.
packages/meta/package.json	Bumps umbrella/meta package version to 0.4.0.
packages/mcp/src/connection.ts	Updates MCP_CLIENT_VERSION constant to 0.4.0 to match package version.
packages/mcp/package.json	Bumps MCP package version to 0.4.0.
packages/foundry/package.json	Bumps Foundry package version to 0.4.0.
packages/core/src/observability/version.ts	Updates INSTRUMENTATION_VERSION constant to 0.4.0 to match package version.
packages/core/package.json	Bumps core package version to 0.4.0.
packages/anthropic/package.json	Bumps Anthropic package version to 0.4.0.
packages/agentserver/src/config.ts	Updates PACKAGE_VERSION constant to 0.4.0 to match package version.
packages/agentserver/package.json	Bumps agentserver package version to 0.4.0.
packages/a2a/package.json	Bumps A2A package version to 0.4.0.
CHANGELOG.md	Finalizes the release notes under ## 0.4.0.

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