fix(deploy): align build-watch deadline with server-side build limit

[ealogar]

The CLI's global command deadline defaulted to 10m while deployment-api caps builds via BUILDER_ACTIVE_DEADLINE_SECONDS (default 15m). Builds taking 10-15m tripped the client-side deadline and surfaced as "failed to watch deployment ... context exceeds deadline" even though the build was still progressing server-side.

• Raise defaultTimeout to 16m so the server-side build limit is always reached first and the CLI reports the real build outcome.
• Replace the bare "context exceeds deadline" error with an actionable message that names the package, notes the build may still be running, and wraps ctx.Err().
• Clarify the --timeout flag help text.

[vonage-ai-assistant]

AI Adoption Report

	Lines	%
AI-generated	115	96%
Human	4	4%
Total	119

💰 Cost Breakdown

Agent	Model	AI Lines	Input Tokens	Output Tokens	Cost	Source
kiro	auto	113	1,316	395	$0.0099	📐 estimated
GitHub Copilot	github-copilot	2	23	7	$0.0000	🤖 Copilot (subscription)

Total Estimated Cost: $0.0099

Data Sources:

• 📐 3 commits with estimated tokens (~3.5 tokens/line)

Bedrock pricing: eu-central-1 region

Per-commit breakdown (4 commits)

Commit	Message	Added	AI	Human	AI %
007fb78	fix: add gitignore	3	0	3	0%
aed283b	test(deploy): cover WatchDeployment ctx.Done() timeout and c	99	99	0	100%
2a37e60	Potential fix for pull request finding	2	2	0	🤖 100% (Copilot)
7771ae8	fix(deploy): align build-watch deadline with server-side bui	15	14	1	93%

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[Copilot]

🟡 Changes recommended

The new ctx.Done() error path in WatchDeployment mislabels cancellations as timeouts and the new behavior isn’t covered by unit tests.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR adjusts the CLI’s global timeout behavior and deployment build-watch error reporting so long-running (10–15m) builds don’t fail client-side before the server-side build deadline is reached.

Changes:

• Increased the root command default timeout from 10m to 16m to exceed the server-side build cap.
• Updated --timeout help text to clarify it is a whole-command deadline (including build watching).
• Replaced the generic build-watch timeout error with an actionable, wrapped error that includes ctx.Err().

File summaries

File	Description
vcr/root/root.go	Raises the global default timeout and clarifies the --timeout flag’s semantics.
pkg/api/deployment.go	Improves the error returned when the build watch exits due to ctx.Done().

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 3
• Review effort level: Lite

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