docs: bicep-lint README section + docs-as-code wiki tree (Phase 36)

[OgeonX-Ai]

Summary

• README: adds a "Validation and Linting" section describing bicepconfig.json's core analyzer ruleset, and explicitly notes the use-recent-api-versions rule is currently off on main pending open PR fix: enable use-recent-api-versions bicep lint rule #11 (verified via gh pr view 11 — state OPEN, mergedAt null). Adds a "Deployment lock" section connecting to the workspace-wide NO-AZURE-deploy hard lock and this repo's bicep-ready-but-not-deployed posture. Freshness footer appended.
• Adds docs/wiki/{Home,Architecture,Operations,Decisions}.md — docs-as-code wiki tree (GitHub native wiki tab intentionally not used).
• Architecture.md includes the module-graph Mermaid diagram plus an explicit NO-AZURE deploy-lock statement, and a codex:generate-image placeholder matching the root docs/VISION.md house style.
• Operations.md documents verified validate.ps1/what-if.ps1 commands and notes there is no coverage-percentage gate (infra-as-code, not an application).
• Decisions.md indexes the two phase summaries and flags PR fix: enable use-recent-api-versions bicep lint rule #11 as the open decision affecting the documented lint posture.

Test plan

• Mermaid block reviewed for GitHub-renderable flowchart subset
• bicepconfig.json's use-recent-api-versions: off verified directly against the file on this branch before writing the "in progress" framing
• PR fix: enable use-recent-api-versions bicep lint rule #11 state verified via gh pr view 11 --repo Coding-Autopilot-System/cas-platform --json state,mergedAt (OPEN) before writing landed-vs-in-progress language

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