feat: add 'vf docs' — search and read the documentation in-band (COR-13588)

[Bradenream]

Part of COR-13588 — shipping the vf CLI as an agent-era distribution channel.

What

vf docs search <query>   # full-text search via the public docs search endpoint
                         # --output-format json → {title, link, page, content}
vf docs get <page>       # print any docs page as markdown, by path or full URL

Zero bundled content (no staleness, no binary growth) and zero auth — it works before any token is configured, so error hints and the quickstart can point at runnable vf docs commands even where the agent has no browser or web access. Search results include full endpoint contracts, so an agent learns an operation's schema from one CLI call.

Lives in a non-generated file (internal/cli/docs.go); the only touch on generated code is the one-line registration in root.go — the same persisted-edit shape that carries the hooks registration. Base branch: #7.

Verification

• 5/5 vitest tests (test/docs-command.test.ts) against the live docs site: search (pretty + json), get by path and by URL, 404 teaching error, non-voiceflow URL refusal
• go vet clean; 15s timeout on every request; offline failure names the fix

[Copilot]

Pull request overview

Adds a new vf docs command group to the CLI so users (and agent workflows) can search Voiceflow documentation and fetch docs pages as markdown directly from the terminal, without authentication.

Changes:

• Register a new docs command group under the root CLI command.
• Implement vf docs search (docs search endpoint) and vf docs get (fetch markdown page) in internal/cli/docs.go.
• Add Vitest coverage for docs search and docs get against the live public docs site.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
test/docs-command.test.ts	Adds integration tests for vf docs search/get against the live docs site.
internal/cli/root.go	Registers the new docs command group on the root command.
internal/cli/docs.go	Implements vf docs command group (search + get), including HTTP request/response handling.

Files not reviewed (1)

• internal/cli/root.go: Generated file

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[linear-code]

COR-13588