refactor(theseus/aegis): rename bundle bchwallet→aegis + retire standalone siawallet

Cleans up the naming that leaked from the wallet's origin story (BCH-only)
into the actual bundle layout. Aegis is one integrated addon now:
- Bundle folder: TheseusNavigator/bundled-addons/aegis/ (was bchwallet/).
- Addon id:      "aegis" (was "bchwallet"). Vault-derive still accepts
                 legacy "bchwallet/*" and "siawallet/*" paths via the
                 absorbs list, so no on-chain funds move.
- Version:       0.4.0 (bumped to trigger seedBundledAddons's reseed).
- Retired:       TheseusNavigator/bundled-addons/siawallet/. Sia is
                 folded into Aegis as a chain adapter (lib/sia/*.js
                 already in-tree) and Aegis's manifest lists siawallet
                 under absorbs so pre-Aegis SC keys derive identically.

main.js migrateAegisRename() runs before seedBundledAddons on every
launch. First run does the move; subsequent runs are no-ops:
- addons/bchwallet/  -> addons-backups/bchwallet-migrated-<stamp>/
- addons-data/bchwallet.json COPIED to addons-data/aegis.json (kept
  copied not moved so a downgrade to 0.3.x can still boot).
- addons/siawallet/  -> addons-backups/siawallet-migrated-<stamp>/
  (addons-data/siawallet.json left untouched — its walletdUrl is
  per-user config Aegis's Sia wallet takes fresh via Settings).

settings.html Aegis update card now matches either "aegis" (new id) or
"bchwallet" (pre-rename) so upgraders coming from 0.3.x see the same
one card while the OTA endpoint's next signed bundle catches up.

Internal purpose paths inside index.js/chain-*.js are unchanged —
LEGACY_BCH_PURPOSE stays "bchwallet/mainnet/0" and every purposePrefix
still starts with "bchwallet/*". The addon absorbs its own former id,
so those paths keep resolving to the same seed the shipping Aegis has
been using since 0.3.14.

bundled-addons/aegis/addon.json

@@ -1,13 +1,13 @@
 {
-  "id": "bchwallet",
+  "id": "aegis",
   "name": "Aegis Wallet",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "Multi-chain wallet (BCH, BTC, TRX, ETH, SOL, SC, DGB) derived from your Theseus vault. Dapps get window.bitcoincash on .x sites; window.tronWeb / window.tronLink / window.ethereum / window.solana on any https page.",
   "author": "Silent Mode",
   "icon": "🛡",
   "main": "index.js",
   "capabilities": ["sidebar-panel", "vault-derive", "page-inject", "approval-modal"],
-  "absorbs": ["siawallet"],
+  "absorbs": ["bchwallet", "siawallet"],
   "page-inject": {
     "preload": "wallet-inject.js",
     "origins": ["https://*/*"]

main.js

@@ -1330,6 +1330,48 @@ function readAddonVersion(dir) {
   try { return JSON.parse(fs.readFileSync(path.join(dir, "addon.json"), "utf8"))?.version ?? null; }
   catch { return null; }
 }
+// One-time migration for the bchwallet → aegis rename + the siawallet
+// retirement. Idempotent: after the first run the sources are gone and
+// subsequent runs are no-ops.
+//
+//   - addons/bchwallet/  → addons-backups/bchwallet-migrated-<stamp>/
+//     (bundle folder is now aegis/; leaving the old dir active would load
+//     the pre-rename copy as a second addon under the same id and clash).
+//   - addons-data/bchwallet.json → addons-data/aegis.json (COPY, so any
+//     downgrade to a 0.3.x build can still read its own storage).
+//   - addons/siawallet/  → addons-backups/siawallet-migrated-<stamp>/
+//     (folded into Aegis via absorbs: ["siawallet"]; keeping it running
+//     would show duplicate Sia UI). Its data file stays under
+//     addons-data/ untouched — Aegis derives its own SC walletdUrl
+//     per-sub-wallet, so users re-paste their URL in Aegis Settings.
+function migrateAegisRename() {
+  const stamp = new Date().toISOString().replace(/[:.]/g, "-");
+  const backups = addonsBackupDir();
+  try { fs.mkdirSync(backups, { recursive: true }); } catch {}
+  const addonsRoot = addonsUserDir();
+  const dataRoot = addonsDataDir();
+
+  const bchDir   = path.join(addonsRoot, "bchwallet");
+  const aegisDir = path.join(addonsRoot, "aegis");
+  const bchJson   = path.join(dataRoot, "bchwallet.json");
+  const aegisJson = path.join(dataRoot, "aegis.json");
+  if (fs.existsSync(bchDir) && !fs.existsSync(aegisDir)) {
+    if (fs.existsSync(bchJson) && !fs.existsSync(aegisJson)) {
+      try { fs.copyFileSync(bchJson, aegisJson); console.log("[addons] migrated bchwallet.json -> aegis.json"); }
+      catch (err) { console.warn("[addons] migrate storage failed:", err?.message); }
+    }
+    const backup = path.join(backups, `bchwallet-migrated-${stamp}`);
+    try { fs.renameSync(bchDir, backup); console.log(`[addons] retired addons/bchwallet -> addons-backups/${path.basename(backup)} (folder renamed to aegis/)`); }
+    catch (err) { console.warn("[addons] retire bchwallet failed:", err?.message); }
+  }
+
+  const siaDir = path.join(addonsRoot, "siawallet");
+  if (fs.existsSync(siaDir)) {
+    const backup = path.join(backups, `siawallet-migrated-${stamp}`);
+    try { fs.renameSync(siaDir, backup); console.log(`[addons] retired addons/siawallet -> addons-backups/${path.basename(backup)} (absorbed by aegis)`); }
+    catch (err) { console.warn("[addons] retire siawallet failed:", err?.message); }
+  }
+}
 function seedBundledAddons() {
   const dst = addonsUserDir();
   try { fs.mkdirSync(dst, { recursive: true }); } catch {}
@@ -1371,6 +1413,9 @@ function initAddons() {
     stagedDir: addonsStagedDir(),
     logger: (...a) => console.log("[addons]", ...a),
   });
+  // Retire the pre-rename bundle layouts before reseeding so the fresh
+  // aegis/ + siawallet-less state is what AddonHost enumerates.
+  migrateAegisRename();
   seedBundledAddons();
   addonHost = new AddonHost({
     addonsDir: addonsUserDir(),

settings.html

@@ -998,14 +998,17 @@
     arRefresh.onclick = refreshAriadne;
     refreshAriadne();
 
-    // ---- Aegis (bchwallet) update card --------------------------------------
+    // ---- Aegis update card --------------------------------------------------
     // Aegis is a bundled add-on but its updates are shipped OTA via the signed
     // add-on update endpoint, so users can get new wallet versions without
     // updating Theseus. The same addons-check-updates IPC the Extensions page
-    // uses is filtered for the bchwallet id so this card only speaks for Aegis.
+    // uses is filtered for the aegis id so this card only speaks for Aegis.
+    // Legacy id "bchwallet" is also matched for upgrades from pre-rename
+    // installs (0.3.x); post-migration the entry lives at id="aegis".
     const aegisStatus = document.getElementById("aegisStatus");
     const aegisCheck  = document.getElementById("aegisCheck");
     const aegisApply  = document.getElementById("aegisApply");
+    const isAegis = (a) => a && (a.id === "aegis" || a.id === "bchwallet");
     async function refreshAegis() {
       aegisApply.hidden = true;
       try {
@@ -1013,8 +1016,8 @@
           C.listAddons ? C.listAddons() : Promise.resolve([]),
           C.listStagedAddonUpdates ? C.listStagedAddonUpdates() : Promise.resolve([]),
         ]);
-        const cur = (installed || []).find((a) => a.id === "bchwallet");
-        const upd = (staged   || []).find((a) => a.id === "bchwallet");
+        const cur = (installed || []).find(isAegis);
+        const upd = (staged   || []).find(isAegis);
         if (!cur) { aegisStatus.textContent = "Aegis isn't installed. Reinstall Theseus to add it back, or open Settings > Extensions to load it manually."; return; }
         const curVer = cur.version || "?";
         if (upd && upd.version) {
@@ -1031,7 +1034,7 @@
       aegisStatus.textContent = "Checking…";
       try {
         const staged = await (C.checkAddonUpdates ? C.checkAddonUpdates() : Promise.resolve([]));
-        const upd = (staged || []).find((a) => a.id === "bchwallet");
+        const upd = (staged || []).find(isAegis);
         if (!upd) { aegisStatus.textContent = "You're on the latest Aegis."; }
         // refresh will populate everything else + toggle the Apply button
         refreshAegis();