Document the signed history rewrite and clone recoveryfeature/private-chat

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diff --git a/docs/GIT-HISTORY.txt b/docs/GIT-HISTORY.txt
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+Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+GIT IDENTITY AND SIGNATURE REWRITE
+
+    Requested to replace the historical ops <ops@localhost> identity with
+    Doan Luu Duc Tai <doan@luuduct.ai> and sign the history with the canonical
+    RSA-2048 key 3346AA3150F8F16828BB0D14F8C66DF77AFECEA6.
+
+    Ten historical author identities and their corresponding committer identities
+    were corrected. All 27 commits reachable from main and feature/private-chat
+    at the time of the rewrite were recreated and signed because rewritten
+    parents change descendant commit IDs. Every new signature was verified.
+
+    Every corresponding tree, message, original author timestamp/time zone, and
+    original committer timestamp/time zone was preserved. Merge topology was
+    preserved. Signature creation times reflect the new signing operation.
+    main's file tree is unchanged. Configuration/chat development stays on
+    feature/private-chat; rewriting metadata does not deploy that code to main.
+
+    Remote updates use an atomic push and exact force-with-lease expectations
+    for both branches, preventing overwrite of an unexpected remote update.
+    Existing objects and reflogs may still contain old IDs: this is an authorship
+    correction, not a claim of private-data removal or historical erasure.
+
+EXISTING CLONES
+
+    The active development checkout is already aligned. Other clones must fetch
+    the new history instead of using an ordinary pull across divergent histories.
+    Preserve local-only commits and working changes first. A fresh development
+    clone is also possible; keep private .env and runtime data out of Git.
+
+    For an existing clone with no local-only commits:
+
+        git fetch origin
+        git switch main
+        git reset --keep origin/main
+
+    For a feature checkout, use feature/private-chat in the final two commands.
+    --keep refuses updates that would overwrite conflicting working changes.
+    Do not blindly reset a clone with independent local work; use the mapping
+    below to identify the corresponding rewritten base before rebasing that work.
+    Git changes do not remove or replace ignored .env or var/ data.
+
+ORIGINAL TO REWRITTEN COMMITS
+
+    47fcc566884d7078c153cdce9fb62399fcca5d9e  c4b2f892a1c6508360a683c90e8c4d596c521336
+    37d5e4a152df67d247349d2ed289bf65859ead53  020d3454cad6619bf25c6ecb0a293502f40364bd
+    8a327a41cdce40933b977f7c6662929488bcf83e  64a1b484abb96c91da9aa23e0e45576749f6cdfe
+    3a8956f9cb85184ae2b8202d7a733124a0d3f95f  9599590f67c24f70c400b967d162095c63f6af61
+    2f5c323be4a44b80cf9e39d51210776146a77cbd  1632c88ba08c62966c1f0b1578741d8af007e6fd
+    118ba081389cfd80b38c9c691fd6d75f6497dcb5  274e70679b83bcac3dee3599bd9389a3332462ec
+    38aa5d1f2a8dfc8ea97c0fdce8feae7e37795533  5317fa43b79e4251fcbcff2b4f1243a961ac00fe
+    902cfd395fb03d6147813560ac5fcd7146702a1d  463c6f48a06730c29f89b2f376e68dc805df5cc9
+    e373f154dbeacc5a0e83b4ec73c3aa316239c029  5386a63bfb2f14cab99874e7c414e1a418b01f67
+    006a1e94075e90fccfe248cd66bf7d0586a86279  84960925108eb2b5950d4c299b15b18893e0c0d0
+    19a0280d7dabd4ca637d8070cc7d3691a0e85bd1  909dce458d4bbef6710c2b4a67cd906902bb7f3f
+    c06e29dae4bb290fd2849f69da1bfa940c5a8222  5bed750baa5d782427e98550d34124f569e2fff8
+    714866be200b882be437375006180456284bab1c  9c7dd654512b8f51af15d50dd75a515566723be7
+    9f070f7ad0952c61b4ee66d2a01ff1bdf7ade0a8  cad7ab1e1ab1dde8ff4ba349cd5b1a05bbd32b05
+    faaac8558431c80a6b8fbcf2c8f17f16d8602ab6  1386bd16b0fd796314d9ad70aede0946bd5c46bd
+    92bf96961c09d7df6b1bfea72eb8a107bcf9e221  d546193ee543a5b1a0a097d0a7deca76e81b7de2
+    0a0cdc0c44dd8b4fb44d8a859962c40c593e98eb  f196233257d247c94550cf822b91bc3c9d8a7f8f
+    1206813d47e8602f08cbeaf27e73453e089e7c52  834a21a7cadce64889856a2a7521440a1519e244
+    d611c869eb12e7fff5754be31775f82200ec958b  b46ece18a424eaea3f396ddae7e45e91d1c0e742
+    436e217c7858888702d2b6d9e655597ccadb7281  f196c27faf265cd14d8d7accf58e87b4df3c8a91
+    7a0ce2805258e8ac061202904379692d53d5dc95  cf2f0e8c6752c401f152a8e534ba166839d4307e
+    774074bb2bbd3bc07f7094cdce0935eca7520725  a0057b13fa4b6bed8aee3132001e79a245efabc8
+    143880db086c617b843340ca7023a879507761f8  0a4da3b86eb69f0f09b802a55e36fa9cf1bbf38c
+    556eaa133e9cfe7f4c8e542708119fdfd311357e  e6b350a1d48ca0490b7a3447bb8d0a4235514b76
+    b7374fe09306c495131cf3673addb76a1dcf017d  3034705b6679bff1802c4180b7b4711b94fed7f9
+    be16d00a8a4750028073e018ab2c58d54af192c4  c3b361c45ac8dd898d5c83a161abed5fc138b6c0
+    28a772cab50b1064e317aedbe4689aea286b1ec4  6933ec28be3dac0dc17cd634c663db3b4818caad