qutebrowser: fix escape sequences and disable session restore

- Simplify escape sequences in bind commands (M, Z keys)
- Add c.session.default_name = '' and c.session.store_size = 0
- Update AGENTS.md (trimmed to 150 lines)
- Update flake.lock with latest dependencies

flake.lock

@@ -64,11 +64,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1772020340,
-        "narHash": "sha256-aqBl3GNpCadMoJ/hVkWTijM1Aeilc278MjM+LA3jK6g=",
+        "lastModified": 1773264488,
+        "narHash": "sha256-rK0507bDuWBrZo+0zts9bCs/+RRUEHuvFE5DHWPxX/Q=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "36e38ca0d9afe4c55405fdf22179a5212243eecc",
+        "rev": "5c0f63f8d55040a7eed69df7e3fcdd15dfb5a04c",
         "type": "github"
       },
       "original": {
@@ -83,11 +83,11 @@
         "nixpkgs": "nixpkgs_3"
       },
       "locked": {
-        "lastModified": 1767232402,
-        "narHash": "sha256-li+h6crnhc5Zqs+M6pn7D7M0W9M63ECNennDjRgzioE=",
+        "lastModified": 1773185476,
+        "narHash": "sha256-COuJkFg669oalmEN3T61gD3gM9SfUsiGvDS9pCOphZY=",
         "owner": "musnix",
         "repo": "musnix",
-        "rev": "d65f98e0b1f792365f1705653d7b2d266ceeff6e",
+        "rev": "739e2a1f94c87d5f4c8b880a12480185cf0d7620",
         "type": "github"
       },
       "original": {
@@ -98,11 +98,11 @@
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1771969195,
-        "narHash": "sha256-qwcDBtrRvJbrrnv1lf/pREQi8t2hWZxVAyeMo7/E9sw=",
+        "lastModified": 1773533765,
+        "narHash": "sha256-qonGfS2lzCgCl59Zl63jF6dIRRpvW3AJooBGMaXjHiY=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "41c6b421bdc301b2624486e11905c9af7b8ec68e",
+        "rev": "f8e82243fd601afb9f59ad230958bd073795cbfe",
         "type": "github"
       },
       "original": {
@@ -128,11 +128,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1771848320,
-        "narHash": "sha256-0MAd+0mun3K/Ns8JATeHT1sX28faLII5hVLq0L3BdZU=",
+        "lastModified": 1773389992,
+        "narHash": "sha256-wvfdLLWJ2I9oEpDd9PfMA8osfIZicoQ5MT1jIwNs9Tk=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "2fc6539b481e1d2569f25f8799236694180c0993",
+        "rev": "c06b4ae3d6599a672a6210b7021d699c351eebda",
         "type": "github"
       },
       "original": {
@@ -158,11 +158,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1766902085,
-        "narHash": "sha256-coBu0ONtFzlwwVBzmjacUQwj3G+lybcZ1oeNSQkgC0M=",
+        "lastModified": 1772198003,
+        "narHash": "sha256-I45esRSssFtJ8p/gLHUZ1OUaaTaVLluNkABkk6arQwE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c0b0e0fddf73fd517c3471e546c0df87a42d53f4",
+        "rev": "dd9b079222d43e1943b6ebd802f04fd959dc8e61",
         "type": "github"
       },
       "original": {
@@ -174,11 +174,11 @@
     },
     "nixpkgs_4": {
       "locked": {
-        "lastModified": 1773476965,
-        "narHash": "sha256-Laaj25PvGeoP5SPhMfMGxvWqM6ZjZ6LdUeEhP6b3czY=",
+        "lastModified": 1773507054,
+        "narHash": "sha256-Q8U5VXgrcxmCxPtCCJCIZkcAX3FCZwGh1GNVIXxMND0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f82ce7af0b79ac154b12e27ed800aeb97413723c",
+        "rev": "e80236013dc8b77aa49ca90e7a12d86f5d8d64c9",
         "type": "github"
       },
       "original": {