Retire the MI300X TW runner pool

[cquil11]

Summary

• Remove the retired pool from runner inventory and hardware metadata.
• Remove its CollectiveX platform and launcher branches while preserving MI325X TW behavior.
• Update the existing localized documentation.

Validation

• CollectiveX matrix tests: 8 passed, 100 subtests passed.
• Bash syntax checks and git diff --check passed.
• No remaining tracked references to the retired pool.

AI model disclosure

Prepared by OpenAI Codex. The exact model version could not be verified from the runtime.

[claude]

Looks good, straightforward retirement/cleanup change. Reviewed the runner/hardware label removal in configs/runners.yaml, the platform block removal in platform_config.json, the case-arm removal and SDMA workaround deletion in launch_mi-tw.sh, the case-pattern trim in launch_swap-blocks.sh, and the doc wording updates (both languages) — confirmed no remaining references to mi300x-tw anywhere in the repo.

Extended reasoning...

Six-file diff retiring the mi300x-tw AMD runner pool: removes it from runner/hardware config, CollectiveX platform config, two launcher scripts' case statements (including a now-obsolete SDMA workaround), and updates English/Chinese docs from plural to singular pool wording. No security-sensitive surface (auth, crypto, permissions) is touched; it's pure deletion of dead branches/config with no new logic. A repo-wide grep confirms no leftover mi300x-tw references, matching the PR's own validation claim, and no bug-hunter findings or outstanding reviewer objections exist in the timeline.