chore: integrate coder/quartz

[johnstcn]

Refactors existing usage of time.Sleep etc. to use github.com/coder/quartz.

🤖 Written by Claude Opus 4.5, reviewed by me.

[github-actions]

✅ Preview binaries are ready!

To test with modules: agentapi_version = "agentapi_175" or download from: https://github.com/coder/agentapi/releases/tag/agentapi_175

[Copilot]

Pull request overview

This pull request integrates the coder/quartz library to provide a clock abstraction throughout the codebase, enabling better testability by allowing time-dependent code to use mock clocks in tests.

Changes:

• Added github.com/coder/quartz dependency to replace direct time package usage
• Replaced time.Now(), time.Sleep(), time.After(), and time.Since() calls with clock-based equivalents
• Updated test files to use quartz.NewMock(t) for deterministic time-based testing

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
go.mod	Added github.com/coder/quartz v0.1.2 dependency and removed unused go.uber.org/atomic
go.sum	Updated dependency checksums including quartz and transitive dependencies
lib/util/util.go	Added Clock field to WaitTimeout struct and replaced time operations with clock-based equivalents
lib/termexec/termexec.go	Added clock field to Process struct and replaced time operations with clock methods
lib/screentracker/conversation.go	Replaced GetTime function with Clock field and updated all time operations to use the clock
lib/screentracker/conversation_test.go	Updated tests to use mock clocks for deterministic testing
lib/httpapi/server.go	Added clock field to Server struct and updated ticker usage in snapshot loop

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[mafredri]

Suggestion: Maybe this could be a little helper? Say, sleep(clock, time.Second)? Seems re-usable (at least below) and clarifies the code.

Might be a useful addition to quartz. Having <-clock.After(time.Second) would also be nice.

[johnstcn]

coder/quartz#12 :D

[mafredri]

Suggestion: Consider wrapping in if err := func() error { ... } so you can defer stop to avoid stopping on each case.

Alternatively, perhaps a helper function that contains the select since at least 2 are identical.

[johnstcn]

Addressed in d211695