add sf.json declaring the samifou.ad tile settings

chore: Apache 2.0 licence and workspace metadata

Adds the licence, sets license and repository on the workspace package, and replaces a real-looking address in a test fixture with example.com.

Merge pull request #1156 from dekaruntime/claude/lockstep-check-1154

ci: enforce lockstep pins against deka's own version (deka#1154)

Merge remote-tracking branch 'origin/main' into claude/lockstep-check-1154

Merge pull request #1157 from dekaruntime/claude/lockstep-0.53.7

Lockstep: pin dsc 0.53.7-canary-f1c935f and corpus-v0.53.7 (rfd#59)

Merge pull request #300 from dekaruntime/claude/lockstep-check-293

ci: enforce lockstep pins against dsc's own version (dsc#293)

ci: quote the lockstep test command (trailing :: broke YAML)

chore: lockstep pins dsc 0.53.7-canary-f1c935f and corpus-v0.53.7 (rfd#59)

ci: enforce lockstep pins against deka's own version (deka#1154)

rfd#68's 2026-09-17 amendment to rfd#59: deka, dsc, testsuite and tour share one version. Add scripts/lockstep-check.sh (pure decision logic, hermetically tested by tests/lockstep-check.sh) and scripts/lockstep-verify.sh, the CI gate that reads deka's workspace Cargo.toml version and fails unless scripts/dsc-version and scripts/testsuite-corpus-version carry that base version (a -canary- suffix is fine), or the immediately previous released version (highest stable vX.Y.Z tag below current) while a bump is mid-flight. Wired into ci.yml as its own fast job, bash only, no Rust build.

closes#1154

ci: enforce lockstep pins against dsc's own version (dsc#293)

rfd#68's 2026-09-17 amendment to rfd#59: deka, dsc, testsuite and tour share one version. Add cargo xtask check-lockstep, which reads dsc's workspace Cargo.toml version and fails unless scripts/deka-runtime-version and scripts/testsuite-corpus-version carry that base version (a -canary- suffix is fine), or the immediately previous released version (highest stable vX.Y.Z tag below current) while a bump is mid-flight. Wired into CI as its own fast job that doesn't build the workspace.

closes#293