chore: bump relaycast to latest (broker crate 4.1.1 + CLI SDK 4.1.6)

[willwashburn]

Aligns the relaycast dependency to the latest across the broker and the CLI/SDK.

Rust broker crate: relaycast =3.0.0 → =4.1.1

Matches the @relaycast/sdk 4.x line. relaycast 4.x adopts the new durable-delivery model and changes its underlying delivery-store DB schema (internal to the crate — no in-repo schema/migrations).

• No broker code changes needed; the 3→4 API surface the broker consumes is unchanged.
• cargo build / cargo clippy clean; cargo test -p agent-relay-broker --lib → 775 passed, 0 failed.

JS SDK: @relaycast/sdk ^4.1.2 → ^4.1.6 (latest patch)

Bumped in agent-relay (CLI) and @agent-relay/sdk so the CLI resolves a single current 4.1.6 across its direct and workspace-transitive paths.

• build:sdk / build:cli clean, CLI tsc --noEmit clean.
• SDK suite 110 passed, CLI suite 374 passed.

Note (runtime): because relaycast 4.x changes its delivery-store schema, existing local broker state written by 3.x may not be forward-compatible. No in-repo migration was added — flagging for a clear-state/migration decision if needed.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between fac4341 and b56cd41.

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• CHANGELOG.md

✅ Files skipped from review due to trivial changes (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

Relaycast crate and SDK dependencies are upgraded across the project. The broker's relaycast Cargo.toml pin is bumped from =3.0.0 to =4.1.1. JavaScript packages (packages/cli and packages/sdk) have @relaycast/sdk updated from ^4.1.2 to ^4.1.6. Changelog entries document both the broker's upgrade and its local delivery store schema change, and the SDK version alignment.

Changes

relaycast ecosystem version alignment across broker and SDK

Layer / File(s)	Summary
Broker relaycast pin upgrade and changelog crates/broker/Cargo.toml, CHANGELOG.md	relaycast exact version pin updated from =3.0.0 to =4.1.1; changelog documents the 3.0→4.1 upgrade and associated local delivery store schema change, plus the agent-relay/@agent-relay/sdk @relaycast/sdk update to 4.1.6.
JavaScript SDK package version updates packages/cli/package.json, packages/sdk/package.json	@relaycast/sdk dependency updated from ^4.1.2 to ^4.1.6 in both the CLI and SDK packages, aligning with the durable-delivery model.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• AgentWorkforce/relay#1069: Both PRs touch the relaycast SDK integration by bumping the relaycast/@relaycast/sdk dependency versions in crates/broker/Cargo.toml and related JS package files.
• AgentWorkforce/relay#1133: Both PRs update the relaycast/@relaycast/sdk dependency in the agent-relay SDK/CLI, with overlapping changes in packages/sdk/package.json and packages/cli/package.json.
• AgentWorkforce/relay#1174: Both PRs update the same Relaycast dependency path—@relaycast/sdk versioning in the agent-relay/@agent-relay/sdk npm packages and related changelog entries.

Suggested reviewers

• khaliqgant

Poem

🐇 The relaycast rivers flow and rise,
From version three to four point one (surprise!),
JavaScript packages leap in line,
Schema shifts and all things align,
This bunny cheers the unified climb! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: bumping relaycast to the latest version across broker and SDK components.
Description check	✅ Passed	The description is thorough and well-structured, covering what changed, why, testing results, and runtime considerations, though it deviates from the repository template structure.
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/bump-relaycast-broker-4

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@CHANGELOG.md`:
- Line 36: The changelog entry for agent-relay-broker at line 36 includes
internal implementation details about "aligning the broker with the
`@relaycast/sdk` 4.x durable-delivery model" that should be removed per coding
guidelines. Simplify the entry by removing the internal reasoning phrase and
keeping only the essential information about the version upgrade (relaycast from
3.0 to 4.1) and its impact (schema change to the relaycast-backed local delivery
store), making the entry concise and impact-first as per the guidelines.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 6c6593c4-9a2a-4912-80e8-b046034ad6ef

📥 Commits

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⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (2)

• CHANGELOG.md
• crates/broker/Cargo.toml