diff --git a/agents/honker/work/queue-283/BUILD.md b/agents/honker/work/queue-283/BUILD.md
index ac01f1c55..937fc888e 100644
--- a/agents/honker/work/queue-283/BUILD.md
+++ b/agents/honker/work/queue-283/BUILD.md
@@ -144,3 +144,36 @@ Fixture grep: `git grep -nE "\beditor\b|\bauthor\b" -- 'packages/library/tests/*
 leaving out mapping.test.mjs, finds nothing. packages/business/tests has no fixtures directory. The
 library fixture mapping.json has no `editor`. The positive control (`vaultPrefix` in mapping.json)
 matches once. No fixture maps an editor or author with surrounding whitespace.
+
+## 2026-10-23 E4 (webby-0230, sage-3606), same departure as E2
+
+Claimed: `queue move 283 in-progress`, op honker-283-start, rev 3642, 19:10:49Z (briefed→in-progress).
+
+Git's ident.c `crud()` strips any byte <= 0x20 and `, : ; < > " \ '` from both ends of an ident. I
+checked that with git 2.55.0: `Jane,` `"Jane"` `'Jane'` `Jane;` `Jane:` `Jane\` and `,Jane` all
+commit as `Jane`, while `Jane.` and `Ja,ne` are kept. mapping.mjs now takes the set from crud()
+rather than from that list: `IDENT_CRUD_END = /^[\u0000-\u0020,:;<>"\\']|[\u0000-\u0020,:;<>"\\']$/`.
+The E2 check became `if (value.trim() !== value || IDENT_CRUD_END.test(value))`, which refuses
+library-mapping-invalid with "editor.<key> must not start or end with whitespace or any of , : ; " ' \".
+`trim()` still catches Unicode whitespace (U+00A0, U+3000), which crud() leaves alone.
+
+Inner characters: IDENT_BAD (`/[\u0000-\u001f\u007f-\u009f<>]/`) already refuses `<`, `>`, newline,
+tab and every other control anywhere in the value. T3 now pins that at the start, the end and the
+middle. Inner `, : ; " ' \` are kept, since git keeps them, and T3 pins that too.
+
+Tests:
+- T3 has one case per character in [space, U+00A0, U+3000, `,`, `:`, `;`, `"`, `'`, `\`], at the start
+  and at the end, for each key. `<`, `>`, newline and tab are pinned at the start, end and middle.
+  Four accepted names have inner crud characters.
+- New round-trip test, "an accepted editor round-trips through a real git commit unchanged". It
+  commits in a scratch repo with editor `Doe, Jane Q.` / `jane.doe@example.invalid.` as author and
+  committer, with GIT_AUTHOR_* and GIT_COMMITTER_* stripped from the env, and asserts `git log`
+  shows exactly the saved values. I preflighted that commit with git 2.55.0 by hand: both values came
+  back unchanged.
+
+M6c now replaces the whole end check (this supersedes the earlier M6c row):
+
+| Mutant | File | Replace | With | Killed by |
+|---|---|---|---|---|
+| M6c | src/mapping.mjs | `if (value.trim() !== value \|\| IDENT_CRUD_END.test(value))` | `if (false)` | mapping.test "editor is optional" (end cases) |
+| M6d | src/mapping.mjs | `if (value.trim() !== value \|\| IDENT_CRUD_END.test(value))` | `if (value.trim() !== value)` | mapping.test "editor is optional" (`,` `:` `;` `"` `'` `\` cases) |
diff --git a/packages/library/src/mapping.mjs b/packages/library/src/mapping.mjs
index 18a62a2f5..d67975ca6 100644
--- a/packages/library/src/mapping.mjs
+++ b/packages/library/src/mapping.mjs
@@ -16,6 +16,9 @@ const KINDS = ['hybrid', 'draft'];
 // C2-01d (F41): the editor ident her Console saves commit under. Git drops `<` and `>` from an ident
 // and commits under a different name, so they refuse here (webby-0169 R1).
 const IDENT_BAD = /[\u0000-\u001f\u007f-\u009f<>]/;
+// Git's ident.c crud() strips any byte <= 0x20 and , : ; < > " \ ' from both ends of an ident, so a
+// value that starts or ends with one would save one name and commit another (sage-3601, sage-3606).
+const IDENT_CRUD_END = /^[\u0000-\u0020,:;<>"\\']|[\u0000-\u0020,:;<>"\\']$/;
 
 // A folder segment from her vault: spaces and capitals are fine, separators, control characters
 // and dot names are not.
@@ -63,8 +66,8 @@ export function checkMapping(entry, where = 'library', { fail = raise } = {}) {
       const value = entry.editor[key];
       if (typeof value !== 'string' || !value.trim() || IDENT_BAD.test(value))
         bad(`editor.${key} must be non-empty text with no control character, < or >`);
-      // Git trims an ident at commit, so a padded value would save one name and commit another (sage-3601).
-      if (value.trim() !== value) bad(`editor.${key} must not start or end with whitespace`);
+      if (value.trim() !== value || IDENT_CRUD_END.test(value))
+        bad(`editor.${key} must not start or end with whitespace or any of , : ; " ' \\`);
     }
   }
 
diff --git a/packages/library/tests/mapping.test.mjs b/packages/library/tests/mapping.test.mjs
index 62124d647..f446d3d82 100644
--- a/packages/library/tests/mapping.test.mjs
+++ b/packages/library/tests/mapping.test.mjs
@@ -1,5 +1,9 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
+import { execFileSync } from 'node:child_process';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
 import { checkMapping, classify, LibraryError } from '../src/index.mjs';
 import { mapping, mappingEntry } from './helpers.mjs';
 
@@ -121,12 +125,33 @@ test('C2-01d: editor is optional, kept when given, and refuses anything but a pl
     invalid({ ...editor, name: bad }, /editor.name must be non-empty text with no control character, < or >/);
     invalid({ ...editor, email: bad }, /editor.email must be non-empty text with no control character, < or >/);
   }
-  // sage-3601: git trims an ident at commit, so surrounding whitespace refuses.
-  for (const padded of [' Her Name', 'Her Name ', ' Her Name ', '\u00a0Her Name', 'Her Name\u3000']) {
-    invalid({ ...editor, name: padded }, /editor.name must not start or end with whitespace/);
-    invalid({ ...editor, email: padded }, /editor.email must not start or end with whitespace/);
+  // sage-3601, sage-3606: git's crud() strips whitespace and , : ; < > " \ ' from both ends of an
+  // ident, so a value starting or ending with one refuses. Inner < > and controls refuse above.
+  const ends = [' ', '\u00a0', '\u3000', ',', ':', ';', '"', "'", '\\'];
+  for (const c of ends) for (const padded of [`${c}Her Name`, `Her Name${c}`]) {
+    invalid({ ...editor, name: padded }, /editor.name must not start or end with whitespace or any of , : ; " ' \\/);
+    invalid({ ...editor, email: padded }, /editor.email must not start or end with whitespace or any of , : ; " ' \\/);
   }
+  for (const c of ['<', '>', '\n', '\t']) for (const padded of [`${c}Her Name`, `Her Name${c}`, `Her${c}Name`])
+    invalid({ ...editor, name: padded }, /editor.name must be non-empty text with no control character, < or >/);
   assert.equal(mapping(e => ({ ...e, editor: { name: 'Her  Middle Name', email: 'her@example.invalid' } })).editor.name, 'Her  Middle Name');
+  for (const name of ['Doe, Jane Q.', 'Jane: "Q" Doe', "O'Neil", 'Back\\slash Name'])
+    assert.equal(mapping(e => ({ ...e, editor: { name, email: 'her@example.invalid' } })).editor.name, name);
+});
+
+// sage-3606: an accepted editor commits under exactly the saved ident, as author and committer. A
+// future git that strips more from an ident fails here.
+test('C2-01d: an accepted editor round-trips through a real git commit unchanged', t => {
+  const editor = mapping(e => ({ ...e, editor: { name: 'Doe, Jane Q.', email: 'jane.doe@example.invalid.' } })).editor;
+  const root = mkdtempSync(join(tmpdir(), 'library-ident-'));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  // An ident in the environment would win over -c, so the commit runs without one.
+  const env = Object.fromEntries(Object.entries(process.env).filter(([k]) => !/^GIT_(AUTHOR|COMMITTER)_/.test(k)));
+  const git = (...args) => execFileSync('git', ['-c', `user.name=${editor.name}`, '-c', `user.email=${editor.email}`,
+    '-c', 'commit.gpgsign=false', '-c', 'core.hooksPath=/dev/null', '-C', root, ...args], { encoding: 'utf8', env });
+  git('init', '-q');
+  git('commit', '-q', '--allow-empty', '-m', 'ident');
+  assert.equal(git('log', '-1', '--format=%an%n%ae%n%cn%n%ce'), `${editor.name}\n${editor.email}\n${editor.name}\n${editor.email}\n`);
 });
 
 test('no playground prefix holds another, and no book folder holds another', () => {