Feat v0.10.0 panel manifest lifecycle (#84)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

CHANGELOG.md

@@ -2,6 +2,45 @@
 
 All notable changes to Armature are documented here.
 
+## v0.10.0 — Panel Manifest + Lifecycle
+
+First version in the Panels series. Adds the plumbing layer for
+composable companion views — a new rendering tier between surfaces
+(full-page) and block renderers (inline). No presentation UI ships
+in this version; floating and docked chrome arrive in v0.10.1–v0.10.2.
+
+**Manifest: `panels` field (provider + consumer)**
+
+- Provider form: packages declare panels as a map of `{ entry, title,
+  icon, description, min_width, min_height, default_width, default_height }`
+- Consumer form: surfaces declare panel dependencies as an array of
+  `"package.panel"` strings (soft dependency — install succeeds even
+  if provider is missing)
+- Validation enforces required `entry` and `title` for providers,
+  `pkg.panel` dot-format for consumers
+
+**Backend: panel resolution at surface load**
+
+- `PanelMeta` struct carries resolved panel metadata
+- `resolvePanels()` resolves consumer references against installed and
+  enabled provider packages at surface render time
+- `window.__PANELS__` injected into base template for extension surfaces
+- Soft-dependency warning logged at install time for unresolved consumers
+
+**Frontend: `sw.panels` SDK module**
+
+- `sw.panels.open(panelId, opts)` — lazy-loads panel JS via dynamic
+  `import()`, mounts into container, caches module for reuse
+- `sw.panels.close(panelId)` — calls cleanup, removes container
+- `sw.panels.toggle(panelId, opts)` — open if closed, close if open
+- `sw.panels.isOpen(panelId)` / `sw.panels.isAvailable(panelId)` — boolean queries
+- `sw.panels.list()` / `sw.panels.active()` — registered and open panel IDs
+- Events: `panels.opened` and `panels.closed` emitted on lifecycle transitions
+- Mount context: `{ sw, params, panelId, close, resize }`
+- Unstyled container (position:fixed div) — v0.10.1 adds FloatingPanel chrome
+
+**Tests:** 10 new — 6 manifest validation, 4 panel resolution
+
 ## v0.9.9 — Surface Access via Roles
 
 Surfaces can now gate access by team role. A manifest declaring