[christabel888]

Closes #812,
Closes #811,
Closes #806,
Closes #805

• Add a docs/WEBHOOKS.md payload schema reference #812: docs/WEBHOOKS.md already exists and is thorough (payload shape, event types, retry behavior, versioning policy) — no change needed, already resolved by prior work.
• Added docs/TROUBLESHOOTING.md covering npm --legacy-peer-deps peer-dependency conflicts, mock-mode-vs-live-contract confusion, and testnet faucet rate limits — cross-referencing CONTRIBUTING.md's existing (and already thorough) Freighter/RPC/contract-deployment troubleshooting section rather than duplicating it (Add a docs/TROUBLESHOOTING.md guide #811).
• Added docs/adr/ADR-009-hidden-streams-frontend-only.md documenting the lib/hidden-streams.ts design (localStorage-only, no on-chain effect) and the rejected on-chain opt-in alternative. Used ADR-009 rather than the issue's suggested ADR-008, since that number is already used twice (a pre-existing collision from two ADRs landing in parallel) — also cleaned up docs/adr/README.md's index, which had a duplicated/malformed table from that same collision (Add an ADR documenting the frontend-only hidden-streams/blocked-senders design #806).
• Added .github/dependabot.yml covering npm (root), cargo (contracts/), and github-actions, weekly schedule, grouped minor/patch updates (Add Dependabot configuration for automated dependency updates #805).

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