codegen: resync gen/ from EF 8b972df7

[heygen-rui-bot]

Auto-generated PR: a production deploy shipped an updated OpenAPI spec. This PR contains the CLI command definitions regenerated from the now-live prod spec in gen/.

What changed

New commands

• heygen template create -- POST /v3/templates
• heygen template delete -- DELETE /v3/templates/{template_id}
• heygen template update -- PATCH /v3/templates/{template_id}
• heygen template variables update -- PUT /v3/templates/{template_id}/variables

Changed commands

• heygen video-agent send: added --idempotency-key; --message now optional

Public command surface only; commands hidden from --help are not listed.
Compared against heygen-cli main at 3a5ea32ad76b571bc1091d83ae38db955dfd3db5.

If CI fails (e.g. missing examples), fix the issue and push to this branch.

Source commit: 8b972df7892f04cb42229df3f1b3de082c30c2fb
Triggered by: https://github.com/heygen-com/experiment-framework/commit/8b972df7892f04cb42229df3f1b3de082c30c2fb

[github-actions]

Command surface: 1 existing command(s) changed

Changed — these already existed, so a change can break existing calls.

heygen video-agent send

+ 			Name: "idempotency-key",
+ 			Type: "string",
+ 			Default: "",
+ 			Required: false,
+ 			Enum: nil,
+ 			Min: nil,
+ 			Max: nil,
+ 			Source: "header",
+ 			JSONName: "Idempotency-Key",
- 			Required: true,
---
+ 			Required: false,

New commands — additive, nothing existing can break.

• heygen template create
• heygen template delete
• heygen template update
• heygen template variables update

_{Reference only, never blocking. See RELEASE.md "Checking for Regressions" for how to read this.}

[heygen-rui-bot]

Superseded by sync/cli-codegen-6bef2eba from EF commit 6bef2eba6210a6d4a9ef6831450264d9a5538b31.