- refactor config-modal, create-from-dsl-modal, and sub-graph for lower complexity
- add missing tests for config-modal-body, sandbox-provider-page, and install-bundle flows
- raise targeted worktree source coverage to 90%+ for lines and statements
Extend variable pattern matching to support both `#` and `@` markers,
with `@` specifically used for agent context variables. Update regex
patterns, text processing logic, and add sub-graph persistence for agent
variable handling.