Vest a canton-token-forge instrument instead of Canton Coin

[lmcorbalan]

Objective

The vesting dApp stops vesting Canton Coin and starts vesting a canton-token-forge instrument, dropping the Daml toolchain requirement with it.

Rationale

Canton Coin ties every write to Splice reference data: AmuletRules, an open mining round and a wallet-service tap. A token-forge instrument replaces all of it with one InstrumentConfig from a CIP-56 registry, cuts grant creation from two wallet approvals to one, and lets the repository run without dpm.

Scope

In scope:

• Vendor the vesting and canton-token-forge DARs as binaries, delete dapp/daml/
• Run the canton-token-forge registry on 3013 and seed a DBT instrument
• Rewrite LedgerBackend, commands.ts and config.ts behind an unchanged VestingBackend
• Add an in-app faucet over InstrumentConfig_Tap

Out of scope:

• More than one instrument, or an instrument picker in the UI
• Hosting a registry for demo.canton-dappbooster
• Moving off @bootnodedev/canton-barebones

Architecture & technical considerations

Design doc: docs/superpowers/specs/2026-09-02-token-forge-vesting-design.md. VestingBackend is the seam that makes this survivable: the UI, the schedule editor and the domain types are untouched. Token-forge only, no second backend alongside Amulet.

Dependencies

canton-token-forge v0.2.0 (registry npm package and DAR) and canton-vesting-forge v0.1.0 (DAR). Both released.

Issue breakdown

• Add the token-forge side alongside the Canton Coin one #154
• Rewrite the backend onto the registry and LockedToken #155
• Delete dapp/daml and the Canton Coin path #156

Acceptance criteria

• A grant is created, accepted, withdrawn, cancelled and residual-claimed in DBT end to end
• dpm is not required to run the repository
• No AmuletRules or mining round reaches a write
• Creating a grant is one wallet approval, not two

Additional context

#134 asks for a Canton Coin faucet. This epic supersedes the asset it names: the faucet lands as an in-app InstrumentConfig_Tap over DBT, in #155.