chore: update CLI help docs

[jy-tan]

No description provided.

[cubic-dev-ai]

2 issues found across 13 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="cmd/short_docs/unit/overview.md">

<violation number="1" location="cmd/short_docs/unit/overview.md:5">
P3: The docs overstate output format: not all `tusk unit` invocations return JSON (the base command/help renders markdown text). Clarify this to avoid misleading scripting users.</violation>
</file>

<file name="cmd/short_docs/drift/drift_overview.md">

<violation number="1" location="cmd/short_docs/drift/drift_overview.md:17">
P3: Fix the sentence grammar: use "wait for it to be ready" for clarity in this user-facing help doc.</violation>
</file>

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