Brand compliance: trademark marks and HC3 product name corrections (#31)

* Brand compliance: trademark marks and product name corrections

- README.md: add ™/® marks to Scale Computing, SC//HyperCore, SC//Fleet,
  Ansible, and Terraform per brand guidelines; add trademark attribution
  footer
- vm-lifecycle.ps1, iso-upload.ps1, SetTag.ps1: update credential prompt
  from obsolete "HC3" to "HyperCore"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Use SC//HyperCore in credential prompt text

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix bare 'Scale' references and typo across READMEs and example script

- README.md: "specific Scale release" → "specific Scale Computing release"
- specific_task/README.md: "against a Scale system" / "on a scale system"
  → "SC//HyperCore™ cluster"
- platform_2025/README.md: add ™ to title to match root README
- Platform2025_SnapshotExampleBash.sh: fix "Scale Compuintg" typo and
  expand to "Scale Computing HyperCore"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Address review feedback: brand naming corrections

Per review on PR #31:
- Drop retired "SC//Platform" umbrella from README titles
- Use full product names: SC//HyperCore virtualization suite,
  SC//Fleet Manager edge orchestration software
- Add ™ to "specific Scale Computing™ release"
- Expand credential prompt text to "Enter SC//HyperCore
  virtualization suite credentials"

Conference name "SC//Platform" retained in platform_2025/README.md
per reviewer's carve-out.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Update README title to SC//HyperCore™ Cluster

Updated the title to reflect the correct branding of SC//HyperCore™.

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>