docs(ci): expand HPC CI/CD architecture to 10-layer, 44-workflow model

[Shards-inc]

Motivation

• Provide a concrete, production-grade CI/CD topology tailored for GPU/kernel projects where determinism, hardware validation, supply-chain security, and signed releases are mandatory.
• Replace a high-level overview with an actionable catalog so teams can map workflows to existing GitHub Actions and self-hosted runner pools.
• Clarify gating and scaling strategies (performance regression, SBOM/provenance, artifact signing) to make release decisions reproducible and auditable.

Description

• Rewrote docs/pipelines/HPC_CICD_ARCHITECTURE.md into a 10-layer CI/CD topology (Pre-commit → Release) and rephrased the deck for repeatability and security.
• Added a full 44-workflow catalog grouped by layer (pre-commit, static analysis, dependency/supply-chain, build matrix, kernel compilation, testing, performance, security, packaging, release) and enumerated primary tooling for each gate.
• Added repository-specific workflow mapping to existing .github/workflows/* files and operational guidance covering performance regression policy, GPU runner recommendations, scaling/caching strategies, coverage enforcement, and security hardening (SBOM, Sigstore/Cosign, SLSA).

Testing

• Ran make lint to validate repository hygiene and observed a failure due to pre-existing ruff violations across unrelated example and source files, confirming this is a documentation-only change and does not introduce new lint issues.
• No runtime or CI workflow executions were modified, and no unit/integration tests were changed for this documentation update.
• The updated document was inspected locally to verify formatting and content completeness.

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