[codex] Clean non-production assets

[eanzhao]

Summary

• remove non-production demos, root workflow samples, local tool apps, generated logs, and their now-orphaned tests
• keep AI-facing assets and the apps/aevatar-console-web frontend workspace intact
• restore CI guard assets under tools/ci and tools/docs, while making guards tolerate the removed demo/legacy CLI paths
• update docs, solution filters, workflow catalog loading, and affected tests so backend/frontend production paths still build and run

Validation

• dotnet restore aevatar.slnx --nologo -p:NuGetAudit=false
• dotnet build aevatar.slnx --no-restore --nologo -p:NuGetAudit=false
• bash tools/ci/architecture_guards.sh
• bash tools/ci/test_solution_ownership_guard.sh
• bash tools/ci/test_stability_guards.sh
• bash tools/ci/projection_route_mapping_guard.sh
• bash tools/ci/slow_test_guards.sh
• bash test/tools/test_docs_tools.sh
• pnpm --dir apps/aevatar-console-web install --frozen-lockfile
• pnpm --dir apps/aevatar-console-web tsc
• pnpm --dir apps/aevatar-console-web test --runInBand
• pnpm --dir apps/aevatar-console-web build

Note: full backend dotnet test aevatar.slnx --no-build --nologo -p:NuGetAudit=false was run during cleanup. The only remaining failure observed there was an external OpenAI Realtime integration timeout when running in the full suite; the affected OpenAI test project passed when rerun separately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.51%. Comparing base (fccb80d) to head (4a02998).

@@            Coverage Diff             @@
##              dev     #858      +/-   ##
==========================================
- Coverage   83.06%   82.51%   -0.56%     
==========================================
  Files         981      981              
  Lines       61936    61933       -3     
  Branches     8069     8068       -1     
==========================================
- Hits        51447    51102     -345     
- Misses       7009     7376     +367     
+ Partials     3480     3455      -25     

Flag	Coverage Δ
ci	82.51% <ø> (-0.56%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...n/WorkflowCapabilityServiceCollectionExtensions.cs	100.00% <ø> (ø)
...ructure/Workflows/FileBackedWorkflowCatalogPort.cs	69.91% <ø> (-2.58%)	⬇️

... and 24 files with indirect coverage changes

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