feat(organizations): add sanity organizations list command

[runeb]

Adds sanity organizations list to display organizations the user has access to.

Displays id, name, and slug in a tabular format. Supports --sort and --order flags matching the projects list pattern. Includes singular topic alias so sanity organization list also works.

[claude]

Claude finished @runeb's task in 55s —— View job

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Review

ProjectOrganization.slug type mismatch

organizations.ts:9 defines slug: string, but list.ts:47 uses slug ?? '' (null guard) and list.test.ts:114 passes slug: null. The interface should be slug: string | null to match actual API behavior. The null guard in the command is correct, but the interface type needs fixing so TypeScript enforces proper handling elsewhere.

Fix this →

[github-actions]

Coverage Delta

File	Statements
packages/@sanity/cli/src/commands/organizations/list.ts	100.0% (new)
packages/@sanity/cli/src/topicAliases.ts	100.0% (±0%)

Comparing 2 changed files against main @ 75d5154f6bd1eb3a9d344c1d65e91775c40ae345

Overall Coverage

Metric	Coverage
Statements	83.0% (+ 0.0%)
Branches	72.7% (+ 0.0%)
Functions	83.3% (+ 0.0%)
Lines	83.5% (+ 0.0%)

[runeb]

Closing in favor of #762 which adds full organizations CRUD commands.