template: catalog-valid model names — 'claude-fable-5-high' is not a model id

[JPDuchesne]

Third live-fire finding of the plans#36 ceremony: with workspace (#81) and credentials (#82) fixed, the agent spawn now fully works — and the run died on model 'claude-fable-5-high' is not in the agent's catalog. The template's default (which cellbound-3d copied) names a model that does not exist: the -high thinking suffix is not part of CLI model names. Fix: claude-fable-5 as the template default, and the per-command example now shows the exact-modelId bracket syntax (claude-fable-5[thinking=true,effort=high]) that resolve_model already matches, which is how a thinking-effort variant is actually pinned. docs/architecture.md example aligned. Companion config fix in cellbound-3d.

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[JPDuchesne]

Correction for the record: claude-fable-5-high was and still is a valid agent --list-models / --model id — past runs used it green. What changed is ai-flow's ACP migration: session/set_model matches the ACP session catalog, which uses plain names + parameterized modelIds — a different naming domain from --list-models. The fix here is still right for the ACP path; the mismatch (job log and template comment point at the wrong catalog) is now tracked in the follow-up issue.