docs(quarto): fix build-log broken refs and fenced-div warnings

[WhalerMike]

Summary

Resolves all WARN entries from the most recent Quarto render run on PR #317 (build succeeded, but the log carried 5 broken-link warnings, 1 broken-link inside adapter-authoring-tutorial.md, and 8 Pandoc fenced-div parser warnings). Each touched file was re-rendered individually with no WARN/ERROR output after the fix.

What changed

File	Fix
docs/404.qmd	Replaced dead targets (adapter-framework.qmd, executive_summary_v1.0.qmd) with 13_FIMF_AdapterRegistry.qmd and customer-documents/executive-briefs/uiao-executive-brief.qmd.
docs/academy/image-pipeline-guide.qmd	Removed link to orphaned inbox/UIAO-Master-Document-Spec.md; kept prose mention (spec is pending canon ingestion per the charter restoration plan).
docs/customer-documents/ROADMAP.qmd	../substrate-status.qmd → ../docs/substrate-status.qmd.
customer-documents/modernization/access-plane/index.qmd	zero-trust.qmd → zero-trust.md.
customer-documents/modernization/client-server-to-hybrid-cloud/08-access-plane.qmd	zero-trust.qmd → zero-trust.md.
customer-documents/modernization/uiao-modernization-program/03-phase2-governance-os.qmd	../../findings/... → ../../../findings/... (matches the convention in 01-phase0 and 04-phase3).
customer-documents/substrate/platform-tooling/quarto-pipeline.qmd §12.4	Replaced multiline-table whose cells contained literal ::: (which tripped the Pandoc fenced-div parser 8 times) with a clean pipe-table where the syntax examples are wrapped in inline-code backticks.
docs/docs/adapter-authoring-tutorial.md	Dropped refs to nonexistent adapter-framework.qmd and adapter-development-guide.md; pointed to the live adapters/adapter-contract.qmd instead.

Not addressed (filed for follow-up)

• The DOCX-only image resource-path warnings (~20 figures referenced as relative paths that Pandoc can't resolve from its temp dir during --to docx). HTML render is unaffected. Different class of fix (Quarto config / resource-path) — left out to keep this PR's scope tight.

Test plan

• Quarto --to html render of the changed files completes with no WARN or ERROR lines (verified locally).
• Full-site CI render (render job) passes with the previously-flagged WARN: Unable to resolve link target: and Pandoc fenced div lines absent from the log.
• link-check CI job passes.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR cleans up Quarto documentation links and markdown constructs to eliminate render-log warnings (broken internal references and Pandoc fenced-div parser warnings), keeping the docs site build output warning-free.

Changes:

• Fixes multiple broken internal doc links by pointing to existing .qmd/.md targets.
• Updates modernization/access-plane references to the current zero-trust.md target.
• Replaces a problematic table whose cells contained literal ::: with a pipe table using inline-code formatting to avoid Pandoc fenced-div warnings.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/404.qmd	Updates quick-link targets to existing docs and executive brief pages.
docs/academy/image-pipeline-guide.qmd	Removes a broken link to an orphaned inbox spec while preserving the informational reference in prose.
docs/customer-documents/ROADMAP.qmd	Fixes the Substrate Status relative link to the correct docs location.
docs/customer-documents/modernization/access-plane/index.qmd	Updates Zero Trust leaf link to the live zero-trust.md document.
docs/customer-documents/modernization/client-server-to-hybrid-cloud/08-access-plane.qmd	Updates Zero Trust cross-reference link to zero-trust.md.
docs/customer-documents/modernization/uiao-modernization-program/03-phase2-governance-os.qmd	Corrects the relative path to the docs/findings/ location for FINDING-002.
docs/customer-documents/substrate/platform-tooling/quarto-pipeline.qmd	Replaces the warning-triggering table with a pipe table and inline-code examples.
docs/docs/adapter-authoring-tutorial.md	Replaces dead adapter framework/guide references with a live adapter contract reference.

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