Complete the capstone scenario and learning framework

[comwanga]

What changed

• Adds typed Community Treasury Recovery policy and participant models, a narrowly scoped policy service, the integrated Core 28.1 scenario executor, and Proof of Spendability exports.
• Adds an applicability-aware attack and verification framework.
• Adds reusable transaction lifecycle recording and connects it to the mandatory Phase 3 scenarios.
• Adds curriculum mapping, Challenge Mode APIs and UI, scenario lifecycle visualization, and educational documentation.
• Reorganizes the sidebar into an educational sequence with collapsible sections and persistent active-page highlighting.
• Extends deterministic proof-bundle generation, RPC capability coverage, scenario catalog integration, and CI dependencies.

Why

BitScope needs to progress from isolated Bitcoin Core demonstrations into a coherent capstone laboratory: policies should be represented as typed data, scenarios should produce reproducible evidence, attacks should only be evaluated when applicable, lifecycle events should be reusable across scenarios, and learners should have a guided path through the material.

The previous flat navigation also exposed every tool at once and did not indicate the selected page, making first-time orientation unnecessarily difficult.

Impact

Learners can now work from foundational node concepts through wallets, transactions, Script, verified scenarios, and advanced tools in a deliberate sequence. Treasury recovery executions and existing Phase 3 scenarios produce stronger lifecycle and proof artifacts, while Challenge Mode connects curriculum objectives to verifiable scenario outcomes.

Validation

• Backend test suite: 303 passed, 9 skipped.
• npx tsc --noEmit.
• npm run build.
• Staged diff whitespace validation.