feat(forms): full Forms API parity — create form, batch update, get single response

[omriariav]

Context

gws forms covers 2 commands (info, responses). The Forms API has 4 more useful methods.

Full gap analysis

Missing — 4 methods

Command	API Method	Args/Flags
forms create	forms.create	--title, --description
forms update <form-id>	forms.batchUpdate	--file (JSON batch update request)
forms response <form-id>	forms.responses.get	--response-id (single response)
forms get <form-id>	forms.get	positional (alias for info, consistency)

Already covered

Command	API Method
forms info	forms.get
forms responses	forms.responses.list

Skipped

Method	Reason
forms.watches.* (create, delete, list, renew)	Push notifications, needs Pub/Sub

Scopes

Current scope (forms.responses.readonly) only covers reading. Need to add:

• forms.body — create/update forms
• forms.body.readonly — read form structure (already works via current scope)

Acceptance criteria

• All 4 new commands implemented and tested
• Scopes updated
• Skills and README updated
• Version bump