feat(#2505): Phase 4 — runtime-aware subagent dispatch (Option A; resolve-dispatch-type query) (#2525)

* feat(#2508): Phase 4 Option A — runtime-aware subagent dispatch via resolve-dispatch-type query (#2505)

* fix(#2508): prose-variant preamble (avoid scanner-tripping literals) + namedDispatch===false-only mapping

* fix(#2508): remove leftover old-preamble lines (keep prose variant only)

* fix #2508: prose-only reference file

* test #2508: regen golden install parity after workflow preamble additions

* fix #2508: remove preamble from plan-phase.md (Phase 6 capstone ceiling); regen size+golden baselines

* docs(changeset): backfill PR #2525 for Phase 4 (#2508)

tests/fixtures/install-tree/augment.json

@@ -205,6 +205,7 @@
   "gsd-core/references/research-verification-protocol.md",
   "gsd-core/references/reviewer-instances.md",
   "gsd-core/references/revision-loop.md",
+  "gsd-core/references/runtime-aware-dispatch.md",
   "gsd-core/references/scout-codebase.md",
   "gsd-core/references/security-asvs-levels.md",
   "gsd-core/references/skeleton-template.md",