Govern task context and advance execution pointer

docs/status/M16-GAP-00027.md

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+# M16-GAP-00027 Status
+
+status: done
+task: WindowManager data-block LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Headless `WindowManager` identity and bounded runtime state: manager identity/name, preset name, window count and interface lock state.
+
+evidence:
+
+- Desktop fixture and reopen report are exact: `window-manager:WinMan`, preset `New Preset`, one window, interface unlocked.
+- WASM/Main exposes the same bounded `windowManager` resource, save/reopen is exact, and malformed Blend input leaves Main unchanged.
+- `npm --prefix web run test:generated-gap -- --task M16-GAP-00027` exited 0.
+
+knownRisk: WindowManager operators, reports, keymaps and live window mutation remain outside this bounded headless slice.
+
+nextTask: `M16-GAP-00028`