Bump version to 0.19.0

[jeremy]

Cuts v0.19.0 from 4523eac7. make bump VERSION=0.19.0 promoted MIGRATING.md's # Unreleased heading and carried the version across eleven version files and eight lockfiles; nothing else in the tree changed.

What the release carries

Nine migration sections were sitting under Unreleased, the oldest since v0.18.0 shipped on 2026-09-10: the Rust SDK's first appearance, the gauges spec drifts (#731), Retry-After converging on SPEC §6's table (#799), Swift's sixth BasecampError.api value (#775), the Python list-body and retryable changes (#906), two exit-code changes, and Event/WebhookEvent gaining PerformedBy (#898) — which also brought the account event feed's wire layer.

Most of the feed work landed after that note was written: the Go connector and its tier-2 conformance family (#777, #705, #778), the generated operations (#898), the split poll-lane errors (#912), the inbox lane (#897), the Layer-1 adapters (#899), and the capacity ceiling (#919).

One note added by hand

The promotion is mechanical, so it could not notice that #912 carries the breaking label with no MIGRATING section to match it. Release notes are generated from labels, so #912 would have appeared under ⚠️ Breaking Changes pointing at nothing.

The honest answer is that there is nothing to migrate, and it is worth saying rather than leaving blank: PollEvents and PollInbox do not exist in v0.18.0 — the EventFeed operations reach a tagged release for the first time in this one — so the error shapes #912 replaced lived only on main and no released code can be holding them. The new section says that, and says why it is there.

After this merges

make release VERSION=0.19.0 from main runs the version-consistency and lockfile-freshness gates, then tags v0.19.0 and pushes it, which triggers the seven publish workflows.

One downstream consumer is waiting on the tag: basecamp-cli is pinned to the main pseudo-version a8046263 for the feed commands and can re-pin to a release once it exists.

---

Summary by cubic

Cuts v0.19.0: moves MIGRATING.md's # Unreleased section under # v0.19.0 and bumps the version across all SDK version files and lockfiles. Aside from one migration note, no SDK behavior changes.

• The EventFeed operations reach a tagged release for the first time in this version, so the error shapes Event feed: split the poll lanes' 410s and give their 400 a reason #912 replaced existed only on main; no released code can be holding them.
• Release notes are generated from labels, so without the note Event feed: split the poll lanes' 410s and give their 400 a reason #912 would appear under Breaking Changes pointing at nothing.
• After merge, make release VERSION=0.19.0 runs the version and lockfile gates, tags v0.19.0, and triggers the seven publish workflows.
• basecamp-cli is pinned to a main pseudo-version for the feed commands and can re-pin once the tag exists.

^{Written for commit 5e33d5e. Summary will update on new commits.}

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-16T21:08:43.980661Z	5e33d5e	PR opened

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[Copilot]

🟢 Approved

The release declarations and lockfile references are consistently synchronized to v0.19.0, with appropriate migration documentation.

Pull request overview

Prepares the coordinated v0.19.0 SDK release by synchronizing version metadata, lockfiles, and migration guidance.

Changes:

• Bumps all SDK version declarations to 0.19.0.
• Refreshes eight lockfiles.
• Promotes the migration section and documents #912’s pre-release breaking changes.

[!TIP]
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File summaries

File	Description
package.json	Bumps the root version.
MIGRATING.md	Promotes v0.19.0 and documents #912.
go/pkg/basecamp/version.go	Bumps the Go SDK version.
typescript/package.json	Bumps the TypeScript package version.
typescript/package-lock.json	Synchronizes the TypeScript lockfile.
typescript/src/client.ts	Updates the TypeScript runtime version.
ruby/lib/basecamp/version.rb	Bumps the Ruby SDK version.
ruby/Gemfile.lock	Synchronizes the Ruby lockfile.
python/pyproject.toml	Bumps the Python package version.
python/src/basecamp/_version.py	Updates the Python runtime version.
python/uv.lock	Synchronizes the Python lockfile.
swift/Sources/Basecamp/BasecampConfig.swift	Bumps the Swift SDK version.
kotlin/sdk/build.gradle.kts	Bumps the Kotlin package version.
kotlin/sdk/src/commonMain/kotlin/com/basecamp/sdk/BasecampConfig.kt	Updates the Kotlin runtime version.
rust/basecamp-sdk/Cargo.toml	Bumps the Rust crate version.
rust/Cargo.lock	Synchronizes the Rust lockfile.
conformance/runner/typescript/package-lock.json	Refreshes the linked TypeScript SDK metadata.
conformance/runner/ruby/Gemfile.lock	Refreshes the linked Ruby SDK version.
conformance/runner/python/uv.lock	Refreshes the linked Python SDK version.
conformance/runner/rust/Cargo.lock	Refreshes the linked Rust SDK version.

Review details

Files not reviewed (2)

• conformance/runner/typescript/package-lock.json: Generated file
• typescript/package-lock.json: Generated file

• Files reviewed: 12/20 changed files
• Comments generated: 0
• Review effort level: Balanced

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