Cardano Updates

GITHUB_OUTPUT rejects multi-line values written with echo key=$(...)
Adding -c (compact) to jq prevents newlines in the JSON array output.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

- Add Scalus to frameworks.json (discoveryPath: onchain/scalus/build.sbt)
- Standardize Scalus examples on SBT: migrate auction from Scala-CLI to SBT
  (src/main/scala structure, build.sbt, GeneratePlutus main class)
- Add payment-splitter .gitignore and mainClass to build.sbt
- Add setup-sbt composite action (setup-java + sbt/setup-sbt@v1 + ivy2 cache)
- Add _compile-scalus.yml reusable workflow (sbt compile + sbt run → plutus.json)
- Rename Aiken artifacts: plutus-<example> → plutus-aiken-<example>
- Add onchain-framework input to off-chain test workflows; artifact and log names
  now include the onchain framework (plutus-<onchain>-<example>,
  logs-<prefix>-<onchain>-<example>) enabling cross-product traceability
- Add cross-product CI jobs in ecosystem-test.yml: compute-cross-matrix,
  compile-scalus, and test-{ccl,mesh,evosdk}-vs-scalus
- Update generate-dashboard.sh to build a cross-product column matrix
  (onchain compile columns + offchain×onchain cross columns)

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Adds a working PyCardano scenario for the token-transfer use case:
generate fresh wallet → fund → mint 10 TestAsset → lock at parameterised
script → unlock back to receiver. All 5 steps run against local
yaci-devkit and exit 0.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Adds PyCardano off-chain scenario for the HTLC validator covering both
spending paths: GUESS (preimage reveal by claimer) and WITHDRAW (owner
refund after expiry), each at a distinct parameterised script address.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Add PyCardano 0.19.2 off-chain scenario for the vesting contract,
exercising both the owner clawback path and the beneficiary deadline
path against a local yaci-devkit node.

Key finding: the slot→POSIX mapping must use zero_time_ms = (block.time
- block.slot) * 1000 without any era-offset, as ogmios uses this exact
formula for valid_after evaluation.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Working PyCardano 0.19.2 off-chain implementation of simple-transfer
that locks 10 ADA at a parameterised PlutusV3 script and claims it
with the receiver's signature against a local yaci-devkit.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Adds the 13-task plan covering CI scaffolding (frameworks.json,
versions.json, setup-python action, reusable workflow, version
check/sync scripts, local-test-offchain hook) plus four pilot use
cases (simple-transfer, vesting, htlc, token-transfer). Also tightens
the spec to drop simple-wallet from the pilot — its existing
implementation is a 3-validator smart-contract wallet, too large
for a runtime smoke-test.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Captures the pilot-set + full-CI approach for adding PyCardano as the
fourth off-chain framework, with five initial use cases
(simple-transfer, simple-wallet, vesting, htlc, token-transfer) and the
end-to-end registry, workflow, version-pin, and dashboard wiring.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>