docs(v1): remove stale Alpha-era current-facing guidance

[aetherxeg-source]

Purpose

Complete the post-v1 public documentation consistency scrub without rewriting historical evidence.

Current-facing corrections

• Support and troubleshooting now identify stable v1.0.0;
• Quickstart and self-service guides no longer label the current release as Public Alpha;
• technical evaluation uses the exact v1.0.0 binary rather than stale alpha.4 wording;
• troubleshooting no longer points at the alpha.3 artifact;
• support policy now describes the already-published stable v1 line;
• marketplace copy uses the stable bounded product state.

Preserved history

Files under historical release/development/archive evidence are intentionally not rewritten merely because they contain Alpha terminology.

Claim boundary

No runtime semantics, compatibility contract, platform support, external-validation claim or release artifact is changed by this PR.

[aetherxeg-source]

Current-facing v1 documentation scrub completed on exact head 4329361d5b43ac5c3056b1d59e5510518253255d.

Decision: V1_PUBLIC_DOC_CONSISTENCY_PASS_BOUNDED.

Verified:

• current-facing Support, Troubleshooting, Self-Service, Marketplace, Quickstart, Support Policy and Technical Evaluation no longer mislabel v1 as Public Alpha;
• stale alpha.3/alpha.4 installation/evaluation references were removed from current guidance;
• historical release/development/archive evidence was deliberately preserved;
• runtime semantics, compatibility contract and supported platform boundary are unchanged;
• CI, Technical Evaluation Pack and Alpha.6 Productization regression are all SUCCESS.

No external validation or broader platform support is claimed.