sf agent test run fails with "RETRY" enum error during status polling

### Summary
`sf agent test run --wait` fails during status polling with:
`INTERNAL_SERVER_ERROR: The specified enum type has no constant with the specified name: RETRY`

### Steps To Reproduce

1. `sf agent test create --spec specs/test.yaml --api-name MyTest -o `
2. `sf agent test run --api-name MyTest -o --wait 5 --json`

### Expected result
Test polls and returns results

### Actual result
Crashes with RETRY enum error

### Additional information
Stack trace

{
"name": "INTERNAL_SERVER_ERROR",
"message": "The specified enum type has no constant with the specified name: RETRY",
"exitCode": 1,
"context": "AgentTestRun",
"data": {
"errorCode": "INTERNAL_SERVER_ERROR",
"message": "The specified enum type has no constant with the specified name: RETRY"
},
"stack": "INTERNAL_SERVER_ERROR: The specified enum type has no constant with the specified name: RETRY\n at SfCommandError.from (file:///opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/sf-plugins-core/lib/SfCommandError.js:48:16)\n at AgentTestRun.catch (file:///opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/sf-plugins-core/lib/sfCommand.js:332:47)\n at AgentTestRun.catch (file:///opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/plugin-agent/lib/commands/agent/test/run.js:117:27)\n at AgentTestRun._run (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@oclif/core/lib/command.js:186:29)\n at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n at async Config.runCommand (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@oclif/core/lib/config/config.js:446:25)\n at async run (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@oclif/core/lib/main.js:97:16)\n at async file:///opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/bin/run.js:15:1",
"cause": "INTERNAL_SERVER_ERROR: The specified enum type has no constant with the specified name: RETRY\n at HttpApi.getError (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@jsforce/jsforce-node/lib/http-api.js:315:15)\n at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n at async /opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@jsforce/jsforce-node/lib/http-api.js:127:33\n at async AgentTester.results (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/agents/lib/agentTester.js:127:25)\n at async Object.poll (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/agents/lib/agentTester.js:89:45)\n at async doPoll (/opt/atlassian/pipelines/agent/build/node_modules/@salesforce/cli/node_modules/@salesforce/core/lib/status/pollingClient.js:62:26) {\n data: {\n errorCode: 'INTERNAL_SERVER_ERROR',\n message: 'The specified enum type has no constant with the specified name: RETRY'\n },\n errorCode: 'INTERNAL_SERVER_ERROR'\n}",
"warnings": [],
"code": "1",
"status": 1,
"commandName": "AgentTestRun"
}

### Root Cause
`TestStatus` type in `@salesforce/agents/src/types.ts` doesn't include 'RETRY':
`type TestStatus = 'NEW' | 'IN_PROGRESS' | 'COMPLETED' | 'ERROR' | 'TERMINATED'`

But the API returns `status: "RETRY"` during polling.

### Impact
- Blocks ALL agent testing via CLI
- No workaround available
- Affects both stable and nightly builds
- `--api-version` flag doesn't help

### System Information

```
CLI:
@salesforce/cli/2.129.2 darwin-x64 node-v20.19.3

Plugin Version:
@oclif/plugin-autocomplete 3.2.41 (core)
@oclif/plugin-commands 4.1.40 (core)
@oclif/plugin-help 6.2.38 (core)
@oclif/plugin-not-found 3.2.75 (core)
@oclif/plugin-plugins 5.4.59 (core)
@oclif/plugin-search 1.2.39 (core)
@oclif/plugin-update 4.7.23 (core)
@oclif/plugin-version 2.2.38 (core)
@oclif/plugin-warn-if-update-available 3.1.55 (core)
@oclif/plugin-which 3.2.44 (core)
@salesforce/cli 2.129.2 (core)
agent 1.32.5 (core)
apex 3.9.13 (core)
api 1.3.11 (core)
auth 4.3.1 (core)
code-analyzer 5.10.2 (user)
data 4.0.80 (core)
deploy-retrieve 3.24.16 (core)
info 3.4.111 (core)
limits 3.3.80 (core)
marketplace 1.3.10 (core)
org 5.9.72 (core)
packaging 2.25.10 (core)
schema 3.3.98 (core)
settings 2.4.60 (core)
signups 2.6.56 (user)
sobject 1.4.86 (core)
telemetry 3.8.3 (core)
templates 56.11.0 (core)
trust 3.7.114 (core)
user 3.8.0 (core)
asp 0.0.0 (link) /Users/gimli/Documents/dev/workspace/altify-qa-deployment/asp
```

```
SF ENV. VARS.
SF_AUTOUPDATE_DISABLE,true
SF_DISABLE_AUTOUPDATE,true
SF_UPDATE_INSTRUCTIONS,Use "npm update --global @salesforce/cli" to update npm-based installations.
```

```
Windows: false
Shell: zsh
Channel: stable
```
---
### Diagnostics
:white_check_mark: pass - salesforcedx plugin isn’t installed
:x: fail - you have at least one linked plugin
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.npmjs.org
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.yarnpkg.com
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.npmjs.org/
:white_check_mark: pass - using latest or latest-rc CLI version
:x: warn - [@salesforce/plugin-deploy-retrieve] sourceApiVersion matches apiVersion
:white_check_mark: pass - can access: https://test.salesforce.com
:white_check_mark: pass - can access: https://appexchange.salesforce.com/services/data
:white_check_mark: pass - can access: https://developer.salesforce.com/media/salesforce-cli/sf/channels/stable/sf-win32-x64-buildmanifest
:x: fail - [@salesforce/plugin-auth] CLI supports v2 crypto