fix(fx): surface spawn-projected quirk emits at the requesting scope

[sini]

Problem

A deferred spawn policy (e.g. the host-aspects battery) projects an aspect into a post-walk nested scope. The aspect's static quirk emit only materialized inside the spawned node, so a pipe policy (broadcast/collect/expose/local) at the scope that requested the projection read [] — the projection did not behave "as if the requesting scope included the aspect directly".

(Surfaced by replicating ~/.claude across a fleet via Syncthing: a user-scope pipe.broadcast of a host-aspects-projected replicateHome quirk returned empty.)

Root cause

Pipe assembly runs once, pre-drain, over the raw walk imports (scopedClassImportsRaw). The spawn materializes later in the drain (mkDrained), so the requesting scope has no entry for the quirk at assembly time — and every pipe reader takes its source straight from the imports map. Feeding the spawn's emit back into the raw map is cyclic (assembly → augmented → hostConfigs → drain → spawn).

Fix

The projected quirk emit is static (no fleet dependency), so it can be surfaced before assembly:

• spawn-node.nix: the spawn return gains quirkEmits — the spawn root's non-host-bound quirk keys (host-bound ones are already stripped via strippableNames and inherit the host's value).
• resolve.nix: hoist the spawn materialization into one shared binding homeNodeSpawns (computed once over raw parentState — also collapsing a previously-duplicated spawnNode sub-walk across the two mkDrained calls), then layer its quirkEmits over the raw imports into a separate importsForPipes map fed to both assemblePipes passes. parentState keeps the unmodified raw map, so the spawn's own internal assembly never re-reads the surfaced quirk (cycle + internal double-count avoidance). The spawn root is absent from the pre-drain scope universe, so the quirk lands exactly once at the requesting scope.

Net: the projected quirk materializes in both scopes — once at the requesting scope (visible to broadcast/collect/expose/local) and once in the spawned node (the existing nested consumer) — with no double-count.

Tests

• Adds the reproducing test pipe-broadcast.test-broadcast-home-pool-to-host.
• Full suite green: 1045/1045.

Draft — still adding the guard set: fleet-collect-sees-once, genuine-double-inclusion-counts-twice, expose, local emit-and-consume, multi-class spawn, host-bound-quirk boundary.