diff --git a/.ai/site-index.json b/.ai/site-index.json
index c189cb0f4..e68037363 100644
--- a/.ai/site-index.json
+++ b/.ai/site-index.json
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@@ -10696,7 +10514,6 @@
       "estimated_token_count_total": 3099
     },
     "hash": "sha256:d2f3ab658ab29514ac161b17df23e0e7c1f63a7fa4fefcef451ef80b413ab757",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -10789,7 +10606,6 @@
       "estimated_token_count_total": 5338
     },
     "hash": "sha256:b3530f5fc5c9e916181dbc259a7fbae9c60100cb0450fc6d47bbb0d140afa075",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -10861,7 +10677,6 @@
       "estimated_token_count_total": 4362
     },
     "hash": "sha256:a66380d109832bbcc12aee24399a728c8213fa2cf6912b7fe563034fc4775593",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -10918,7 +10733,6 @@
       "estimated_token_count_total": 2138
     },
     "hash": "sha256:ff2c267284959711782c0d6ecb4b439c3a6cc31f763d5e1ff2cc3b1f6efb62b2",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -10970,7 +10784,6 @@
       "estimated_token_count_total": 2929
     },
     "hash": "sha256:5d455d265430e71b2a8a8f5d4ba64caab329b5f6e959375ca7c5f8580ed00003",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11062,7 +10875,6 @@
       "estimated_token_count_total": 4791
     },
     "hash": "sha256:24d101e192069fd4a1a829a7197c8878af0eabeca8ef5c3100ddbe46ec116488",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11144,7 +10956,6 @@
       "estimated_token_count_total": 2559
     },
     "hash": "sha256:b446e5283fb0399f16b23a269bbbe8cca7ed08274fae7611e9e3a7aa921ae662",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11207,7 +11018,6 @@
       "estimated_token_count_total": 3257
     },
     "hash": "sha256:5da581453e1e0b0b9659c2c74fe2c0c3e8060fa04445dd389644626e4232916d",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11234,7 +11044,6 @@
       "estimated_token_count_total": 42
     },
     "hash": "sha256:06acc146698c1d3224544987d7ee52da498e3179228f98a494e385c5786a3a2c",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11271,7 +11080,6 @@
       "estimated_token_count_total": 107
     },
     "hash": "sha256:fdd391227992c966de25b9240f5492135a9993859ec42b77952c1aa3d2e39ed9",
-    "last_modified": "2025-10-24T15:35:36+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11338,7 +11146,6 @@
       "estimated_token_count_total": 4242
     },
     "hash": "sha256:2f11054e0d31c003ebae5d990b559bd56741d190ca409f6ad060216245fa2d17",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11395,7 +11202,6 @@
       "estimated_token_count_total": 2263
     },
     "hash": "sha256:a6a535f4f5e145d3e2a7518739f752ee3ed37b7745483f414e21c97792331d18",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11443,7 +11249,6 @@
       "estimated_token_count_total": 1571
     },
     "hash": "sha256:3ad540d8ad636304705cccb08bc1fdf21fe2fc7dc0f99bd509b23ae96d20e0ba",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11535,7 +11340,6 @@
       "estimated_token_count_total": 2140
     },
     "hash": "sha256:388c988338ed84589c546bb1606d08641fb931dae307d3df92aeccd2e4986080",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11577,7 +11381,6 @@
       "estimated_token_count_total": 400
     },
     "hash": "sha256:20879ce95cc9ef66354350e0005642b0b3b35e412c0d4e34ad49aec3fd1a548c",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11614,7 +11417,6 @@
       "estimated_token_count_total": 229
     },
     "hash": "sha256:9d2299b006c2393409ba46f729c6970f9e4d485d5164be6465f5f390969cd881",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11683,7 +11485,6 @@
       "estimated_token_count_total": 2737
     },
     "hash": "sha256:b3bae6a7538228ab76099223b4712df93d53727f2a559faf60516a3cd0165178",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11752,7 +11553,6 @@
       "estimated_token_count_total": 2580
     },
     "hash": "sha256:b6570ad1b32bb07cf0ae33442e6189e1837bfa28f687e589ca189851aa292091",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11784,7 +11584,6 @@
       "estimated_token_count_total": 80
     },
     "hash": "sha256:1dfbb8c3cfa27f92e982b4ce705415e117c50eb38f641691129863b474741da7",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11821,7 +11620,6 @@
       "estimated_token_count_total": 258
     },
     "hash": "sha256:60a52164328f3776b04f171212dc2407aa991f8f5b83a2d65855c96ca9ea06b2",
-    "last_modified": "2025-10-24T15:35:36+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11879,7 +11677,6 @@
       "estimated_token_count_total": 2670
     },
     "hash": "sha256:07629376480e74afc7fe4d91df539b6ab22453df0f8143df11cc51ef9a78f736",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11906,7 +11703,6 @@
       "estimated_token_count_total": 12
     },
     "hash": "sha256:94dbafb2d78b87d5f0f0c75de002501b8210ac8d66072bc07989f685837cbac5",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -11960,7 +11756,6 @@
       "estimated_token_count_total": 2056
     },
     "hash": "sha256:cf9197d6909dd8865e8838cad95e3692fefaecc3d2f4773b26809a02051d620f",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12014,7 +11809,6 @@
       "estimated_token_count_total": 2220
     },
     "hash": "sha256:aa6371024bb78c3eeedb6820a37859670046fd0e4f756ad417b20c39fb2983b9",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12067,7 +11861,6 @@
       "estimated_token_count_total": 1760
     },
     "hash": "sha256:4f3e2e50a595b0f93078ce0f63185a6f367ae341ae8afac10709c061c54b3307",
-    "last_modified": "2025-10-24T15:35:38+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12140,7 +11933,6 @@
       "estimated_token_count_total": 5126
     },
     "hash": "sha256:12cbf7c21f969c771ab046ddf836a1967f80e89e8e379d30e4ecdced43d3b160",
-    "last_modified": "2025-10-24T15:35:39+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12223,7 +12015,6 @@
       "estimated_token_count_total": 6212
     },
     "hash": "sha256:1c637fe7a53d42add1a2ee09091d79f2086f2fe3091674e58b40574ae49bb2ec",
-    "last_modified": "2025-10-24T15:35:41+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12286,7 +12077,6 @@
       "estimated_token_count_total": 4130
     },
     "hash": "sha256:576067f5cd3a315dea7998f9bb729c93646e38b586f73402d05be6d75e38c80f",
-    "last_modified": "2025-10-24T15:35:42+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12318,7 +12108,6 @@
       "estimated_token_count_total": 77
     },
     "hash": "sha256:8d8fc5f794d4c793586cd3d412627f5e2fe76f182c75c3687abcf33deed5d65e",
-    "last_modified": "2025-10-24T15:35:41+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12355,7 +12144,6 @@
       "estimated_token_count_total": 130
     },
     "hash": "sha256:66bc34a12c50539dde2ffc69fe66891f73d3e1a2da5833ada15e26744ff32209",
-    "last_modified": "2025-10-24T15:35:37+00:00",
     "token_estimator": "heuristic-v1"
   },
   {
@@ -12397,7 +12185,6 @@
       "estimated_token_count_total": 594
     },
     "hash": "sha256:3708031bfcbb55206c4a9aed14f4afbb9f742ea02ebb70dc350390f484c91a0b",
-    "last_modified": "2025-10-24T15:35:36+00:00",
     "token_estimator": "heuristic-v1"
   }
 ]
\ No newline at end of file
diff --git a/scripts/generate_site_index.py b/scripts/generate_site_index.py
index bd0356ce9..83a0dca37 100644
--- a/scripts/generate_site_index.py
+++ b/scripts/generate_site_index.py
@@ -374,7 +374,6 @@ def build_site_index(config_path: str, dry_run: bool = False, limit: int = 0,
             "outline": outline,
             "stats": stats,
             "hash": sha256_text(page.body),
-            "last_modified": file_mtime,
             "token_estimator": token_estimator,
         })