feat: send a mobilecli User-Agent on cloud requests

[gmegidish]

Problem

mobilecli sets no User-Agent on its cloud calls (rpc/rest.go set only Authorization and Content-Type), so it arrives at the fleet server as Go's default Go-http-client/2.0 — the same string as the autoscaler, /api/v1/_instances/poll, and every other Go client. There is currently no way to tell mobilecli usage apart from background infrastructure traffic in the access logs.

mobilewright already identifies itself (mobilewright/0.0.54 shows up cleanly on /api/v1/sessions); mobilecli should too.

Change

Every outbound request now carries mobilecli/<version>:

• REST calls to the fleet server (rpc.RESTCall)
• the /ws JSON-RPC websocket handshake (rpc.Dial)
• the device-code login posts to /login/device/code and /login/device/token — also an account-creation entry point, so these are worth attributing

Version moves from server/server.go to a new utils/version.go, because the low-level rpc package cannot import server (server already imports rpc — that would be a cycle). utils is already a dependency of both. The release workflow's three sed lines move with it.

Summary by CodeRabbit

• Improvements

  • Added consistent version identification across command-line output, server information, and release builds.
  • Added mobilecli version information to authenticated REST and RPC requests.
  • Authentication requests now include standardized request headers.

• Bug Fixes

  • Improved release version handling across macOS, Linux, and Windows builds.
  • Enhanced validation of reported client versions in request handling.

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• cli/auth.go
• rpc/useragent_test.go

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📝 Walkthrough

Walkthrough

The change centralizes the release version in utils.Version and adds utils.UserAgent(). Authentication, REST, and WebSocket requests now send a versioned mobilecli/ User-Agent. Release workflows update the new version source.

Changes

Client identity and release versioning

Layer / File(s)	Summary
Centralized release version source .github/workflows/build.yml, utils/version.go, cli/root.go, server/server.go	Release workflows update utils/version.go. CLI and server version reporting use utils.Version.
Authentication request headers cli/auth.go	Device-code and token-polling requests use postJSON, which sets JSON content type and the versioned User-Agent.
RPC request headers and validation rpc/rest.go, rpc/rpc.go, rpc/useragent_test.go	REST and WebSocket requests set the shared User-Agent. The test verifies the exact versioned value and reports response-write errors.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 838c1

This change adds a versioned mobilecli User-Agent to cloud authentication, REST, and WebSocket requests while centralizing release versioning. The current implementation and coverage show no remaining merge-readiness risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 7 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: adding a mobilecli User-Agent to cloud requests.
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.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/mobilecli-user-agent

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Actionable comments posted: 1

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Inline comments:
In `@rpc/useragent_test.go`:
- Around line 31-32: Update the User-Agent assertion in the relevant test to
compare got exactly with "mobilecli/" plus utils.Version, replacing the current
strings.HasPrefix check so the test validates both the product name and release
version.

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📥 Commits

Reviewing files that changed from the base of the PR and between 5e38052 and 68fbee5.

📒 Files selected for processing (8)

• .github/workflows/build.yml
• cli/auth.go
• cli/root.go
• rpc/rest.go
• rpc/rpc.go
• rpc/useragent_test.go
• server/server.go
• utils/version.go

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