synthesize

name	synthesize
description	Merge N independent per-slice designs (plus the research they rest on) into ONE coherent phased plan in .rpiv/artifacts/plans/ — reconciling cross-slice overlaps, wiring inter-slice integration, and ordering phases by slice dependencies. Single-pass, no subagents, no self-review. The fan-in barrier of a fanout-and-synthesize flow — one phase per slice, plan-compatible so implement/validate consume it unchanged. For large slice maps it also runs hierarchically — as a per-cluster partial (`--as-subplan` turns designs into a subplan) and as the root merge (`--subplans` turns subplans into a plan) — so no single pass must hold every design at once. Use after a per-slice design fanout.
argument-hint	--designs <path>... [--research <path>] [--as-subplan] [--cluster <k>] | --subplans <path>... [--research <path>]
allowed-tools	Read, Grep, Glob, Write
shell-timeout	10
disable-model-invocation	true
contract	{"produces":{"kind":"produces","meta":{"artifactKind":"plan"},"data":{"type":"object","required":"[Truncated]","properties":"[Truncated]"}},"consumes":{"reads":{"designs":"[Truncated]","subplans":"[Truncated]","research":"[Truncated]"}}}

Synthesize

You merge several independent per-slice designs into one coherent phased plan. One pass. You do not redesign a slice or write code — you reconcile and sequence what the slice designs already decided. This is the fan-in barrier: each design was produced blind to the others, so your job is to make them fit together. No subagents, no self-review — the workflow's grade panel judges the merged plan.

Input

$ARGUMENTS — flags (the orchestrator wires them from the fan-in):

• --designs <path> (repeats) — per-slice design docs from the design fanout.
• --subplans <path> (repeats) — partial sub-plans from a cluster fanout (root mode).
• --research <path> (optional) — the research the slices rest on, for cross-slice constraints.
• --as-subplan (flag) — emit a sub-plan (partial mode) instead of a full plan.
• --cluster <k> (optional, partial mode) — the ordinal written into the sub-plan's _cluster-<k>.md filename. The cluster fanout supplies it; for manual partial invocation pick an unused <k> (scan .rpiv/artifacts/subplans/ for existing *_cluster-<k>.md and take the next unused positive integer) so a re-dispatched pass writes a distinct file and never clobbers a sibling sub-plan.

If neither --designs nor --subplans is present, print an error and stop.

Modes

Pick the mode from the flags — the work is the same fan-in reconciliation at three scales:

Mode	Selected by	Reads	Writes to	Output kind
Flat (default)	--designs only	every design	.rpiv/artifacts/plans/	full plan
Partial (per-cluster)	--designs … --as-subplan	one cluster's designs	.rpiv/artifacts/subplans/	sub-plan
Root (merge)