* add coder_external_agent resource

* Change token to agent_id

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…429)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.10.0 to 1.11.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.10.0...v1.11.0)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-version: 1.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [golang.org/x/mod](https://github.com/golang/mod) from 0.25.0 to 0.27.0.
- [Commits](golang/mod@v0.25.0...v0.27.0)

---
updated-dependencies:
- dependency-name: golang.org/x/mod
  dependency-version: 0.27.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* docs: add Premium license warning for external_agent resource

Co-authored-by: M Atif Ali <U04T3LN8ASU+AtifCoder@users.noreply.github.com>

* fix: add Premium license warning to external_agent resource description

The warning needs to be in the Go code description field so it gets
auto-generated into the documentation.

Co-authored-by: M Atif Ali <U04T3LN8ASU+AtifCoder@users.noreply.github.com>

* docs: remove manual markdown edit to let auto-generation handle warning

The warning is now properly added in the Go code description field
and will be auto-generated into the documentation.

Co-authored-by: M Atif Ali <U04T3LN8ASU+AtifCoder@users.noreply.github.com>

* docs: add Premium license warning with pricing link to external_agent

Updated the Go code description to include a warning about Premium
license requirement with a link to pricing, then ran make gen to
regenerate the documentation.

Co-authored-by: M Atif Ali <U04T3LN8ASU+AtifCoder@users.noreply.github.com>

---------

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: M Atif Ali <U04T3LN8ASU+AtifCoder@users.noreply.github.com>