spec(processes): parallel fork/join step (kind: parallel) - #7
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A parallel step runs its branch steps concurrently and joins before next - a parallel-gateway fork/join. v1: >=2 single-step task branches joining directly, no branch chains or nested parallels (recorded under Planned).
A branch continues through its own routing (its `next`, a decision's `then`/`else`, a boundary timer branch) and may itself be a `parallel`. Everything reachable that way belongs to the branch; a step declaring no routing is a terminal and joins, and the new routing literal `join` converges on the innermost enclosing join gateway - which is how a decision inside a branch rejoins from both arms. Records the rules that keep a branch a closed sub-flow: `join` only inside a branch (and never a step name), no `end` inside a branch, no step in two branches, a branch entered through its fork only, and `next` optional on a nested fork. Drops the corresponding "Planned" entry.
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kind: parallelstep: run branch steps concurrently and rejoin beforenext(a parallel-gateway fork/join). At least two branches, each a single declared task step that joins directly;nextis a declared step orend. Multi-step branch chains and nested parallels are recorded under Planned. Leaving open for the maintainer.