Add work-queue programming-model demonstrator

[koliyo]

Summary

• Adds a docs-only standalone Rocci app (examples/rocci/standalone/work-queue) that shows which @method:role to use for a shared SQLite work queue: fragments for this-tab HTML, commands for writes with no representation, live for the shared board.
• Wires catalog, inventory, examples nav, handlers guide, and staging-tree notes without retargeting handler-matrix’s complete-matrix links.
• Adds a template compile fixture and CLI HTTP smoke for the generated routes.

Test plan

• cargo test -p rocci-template --test compile work_queue -- --nocapture
• cargo test -p rocci-cli --lib work_queue -- --nocapture
• cargo run -q -p rocci-cli -- inspect --ast examples/rocci/standalone/work-queue/WorkQueue.rocci
• Two tabs on rocci run …/WorkQueue.rocci: inspect fills one well only; enqueue/claim update both boards, not composer/inspect.

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