diff --git a/LifeOS/install/hooks/DocIntegrity.hook.ts b/LifeOS/install/hooks/DocIntegrity.hook.ts
index 154235fd46..5b6a43e672 100755
--- a/LifeOS/install/hooks/DocIntegrity.hook.ts
+++ b/LifeOS/install/hooks/DocIntegrity.hook.ts
@@ -19,6 +19,8 @@ import { readHookInput, parseTranscriptFromInput } from './lib/hook-io';
 import { handleDocCrossRefIntegrity } from './handlers/DocCrossRefIntegrity';
 import { handleRebuildArchSummary } from './handlers/RebuildArchSummary';
 import { handleMemoryDirIntegrity } from './handlers/MemoryDirIntegrity';
+import { handleRebuildKnowledgeSchema } from './handlers/RebuildKnowledgeSchema';
+import { handleKnowledgeConformance } from './handlers/KnowledgeConformance';
 
 async function main() {
   const input = await readHookInput();
@@ -59,6 +61,18 @@ async function main() {
     console.error('[DocIntegrity] Memory-dir handler failed:', err);
   }
 
+  try {
+    await handleRebuildKnowledgeSchema();
+  } catch (err) {
+    console.error('[DocIntegrity] Knowledge-schema regen failed:', err);
+  }
+
+  try {
+    await handleKnowledgeConformance();
+  } catch (err) {
+    console.error('[DocIntegrity] Knowledge-conformance check failed:', err);
+  }
+
   process.exit(0);
 }
 
diff --git a/LifeOS/install/hooks/KnowledgeWriteGuard.hook.ts b/LifeOS/install/hooks/KnowledgeWriteGuard.hook.ts
new file mode 100644
index 0000000000..851dc1b433
--- /dev/null
+++ b/LifeOS/install/hooks/KnowledgeWriteGuard.hook.ts
@@ -0,0 +1,90 @@
+#!/usr/bin/env bun
+/**
+ * KnowledgeWriteGuard.hook.ts — schema feedback at the moment a note is written.
+ *
+ * PURPOSE:
+ * `MemorySystem.renderInitialNote` is the sanctioned way a Knowledge note is
+ * born on the schema, but nothing prevents a writer from bypassing it. A bulk
+ * import did exactly that and wrote 1,744 notes off-schema; every later writer
+ * then read a neighbouring note, copied its frontmatter, and spread the legacy
+ * dialect further. The convention was documented and unenforced.
+ *
+ * KnowledgeConformance reports the damage on the Stop pass. This reports it at
+ * the write, while the author is still in the loop and the fix is one edit
+ * rather than a migration.
+ *
+ * TRIGGER: PostToolUse, matcher Write|Edit|MultiEdit
+ *
+ * CONTRACT:
+ *   Advisory only. Emits `additionalContext` naming the violations and the
+ *   canonical writer. NEVER blocks — a hard gate on note-writing would be worse
+ *   than the drift it prevents, and the note is already on disk by PostToolUse.
+ *   Silent for every path outside MEMORY/KNOWLEDGE/<Type>/*.md.
+ */
+
+import { readFileSync, existsSync } from 'fs';
+import { join, sep } from 'path';
+import { getLifeosDir } from './lib/paths';
+import { parseNote, validate, slugFromPath, DIR_TO_TYPE, type CanonicalType } from '../LIFEOS/TOOLS/KnowledgeSchema';
+
+const KNOWLEDGE_DIR = join(getLifeosDir(), 'MEMORY', 'KNOWLEDGE');
+
+function readStdin(): Promise<string> {
+  return new Promise((resolve) => {
+    let data = '';
+    const timer = setTimeout(() => resolve(data), 2000);
+    process.stdin.on('data', (c) => { data += c.toString(); });
+    process.stdin.on('end', () => { clearTimeout(timer); resolve(data); });
+    process.stdin.on('error', () => { clearTimeout(timer); resolve(data); });
+  });
+}
+
+/** The note's directory decides its type; anything outside a typed dir is not a note. */
+function knowledgeDirOf(path: string): string | null {
+  if (!path.endsWith('.md')) return null;
+  if (!path.startsWith(KNOWLEDGE_DIR + sep)) return null;
+  const rest = path.slice(KNOWLEDGE_DIR.length + 1).split(sep);
+  if (rest.length !== 2) return null;                 // must be KNOWLEDGE/<Dir>/<file>.md
+  if (rest[1].startsWith('_')) return null;           // _index.md / _schema.md are not notes
+  return DIR_TO_TYPE[rest[0]] ? rest[0] : null;
+}
+
+(async () => {
+  const raw = await readStdin();
+  if (!raw.trim()) process.exit(0);
+
+  let input: Record<string, any>;
+  try { input = JSON.parse(raw); } catch { process.exit(0); }
+
+  const path: string = input?.tool_input?.file_path ?? '';
+  const dir = path ? knowledgeDirOf(path) : null;
+  if (!dir || !existsSync(path)) process.exit(0);
+
+  let violations: { key: string; problem: string }[] = [];
+  try {
+    violations = validate(
+      parseNote(readFileSync(path, 'utf-8')),
+      slugFromPath(path),
+      DIR_TO_TYPE[dir] as CanonicalType,
+    );
+  } catch {
+    violations = [{ key: 'frontmatter', problem: 'could not be parsed' }];
+  }
+  if (violations.length === 0) process.exit(0);
+
+  const lines = violations.slice(0, 6).map((v) => `  - \`${v.key}\` — ${v.problem}`);
+  const more = violations.length > 6 ? `\n  …and ${violations.length - 6} more` : '';
+
+  console.log(JSON.stringify({
+    hookSpecificOutput: {
+      hookEventName: input.hook_event_name || 'PostToolUse',
+      additionalContext:
+        `⚠ Knowledge note written off-schema — \`${path.split(sep).slice(-2).join('/')}\`\n` +
+        lines.join('\n') + more +
+        `\n\nNotes are born on the schema via \`MemorySystem.renderInitialNote\`. ` +
+        `Do not hand-write frontmatter by copying a sibling — that is how a legacy dialect spreads. ` +
+        `Fix this note now, or run \`bun LIFEOS/TOOLS/MigrateKnowledge.ts\` (dry-run by default) for a bulk repair.`,
+    },
+  }));
+  process.exit(0);
+})().catch(() => process.exit(0));
diff --git a/LifeOS/install/hooks/handlers/KnowledgeConformance.ts b/LifeOS/install/hooks/handlers/KnowledgeConformance.ts
new file mode 100644
index 0000000000..ca300c32c8
--- /dev/null
+++ b/LifeOS/install/hooks/handlers/KnowledgeConformance.ts
@@ -0,0 +1,119 @@
+#!/usr/bin/env bun
+/**
+ * KnowledgeConformance.ts — Knowledge Archive schema conformance checker
+ *
+ * PURPOSE:
+ * RebuildKnowledgeSchema keeps `_schema.md` honest against `KnowledgeSchema.ts`,
+ * so the DOC can no longer drift from the CODE. Nothing, however, checks whether
+ * the NOTES conform to either. That gap is how an archive reached 0.9%
+ * conformance without a single warning: a bulk import wrote 1,744 notes off
+ * schema, later writers copied their frontmatter, and the only tool that could
+ * have said so (KnowledgeLint) was never invoked by anything.
+ *
+ * This closes the detection half. It reports; it never edits or blocks.
+ *
+ * TRIGGER: Stop hook (called from DocIntegrity.hook.ts)
+ *
+ * READS:
+ *   MEMORY/KNOWLEDGE/{People,Companies,Ideas,Research,Blogs,Books}/*.md
+ *
+ * WRITES:
+ *   stderr (audit log with [KnowledgeConformance] tag)
+ *   STATE/events.jsonl (typed event: doc.integrity.knowledge_conformance)
+ *
+ * SIDE EFFECTS:
+ *   None — read-only check. Non-conformance is a soft warning. Never blocks.
+ */
+
+import { readdirSync, readFileSync, existsSync, appendFileSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { getLifeosDir } from '../lib/paths';
+import { parseNote, validate, slugFromPath, DIR_TO_TYPE, type CanonicalType } from '../../LIFEOS/TOOLS/KnowledgeSchema';
+
+const TAG = '[KnowledgeConformance]';
+const LIFEOS_DIR = getLifeosDir();
+const MEMORY_DIR = join(LIFEOS_DIR, 'MEMORY');
+const KNOWLEDGE_DIR = join(MEMORY_DIR, 'KNOWLEDGE');
+const EVENTS_FILE = join(MEMORY_DIR, 'STATE', 'events.jsonl');
+const DIRS = ['People', 'Companies', 'Ideas', 'Research', 'Blogs', 'Books'] as const;
+
+function emitEvent(payload: Record<string, unknown>): void {
+  try {
+    mkdirSync(join(MEMORY_DIR, 'STATE'), { recursive: true });
+    appendFileSync(EVENTS_FILE, JSON.stringify({ timestamp: new Date().toISOString(), ...payload }) + '\n', 'utf-8');
+  } catch {
+    /* non-fatal */
+  }
+}
+
+export async function handleKnowledgeConformance(): Promise<void> {
+  const startTime = Date.now();
+  if (!existsSync(KNOWLEDGE_DIR)) return;
+
+  let total = 0;
+  let conformant = 0;
+  const byDir: Record<string, { n: number; ok: number }> = {};
+  const violationCounts: Record<string, number> = {};
+
+  for (const dir of DIRS) {
+    const dirPath = join(KNOWLEDGE_DIR, dir);
+    if (!existsSync(dirPath)) continue;
+    const dirType = DIR_TO_TYPE[dir] as CanonicalType;
+    byDir[dir] = { n: 0, ok: 0 };
+
+    for (const file of readdirSync(dirPath)) {
+      if (!file.endsWith('.md') || file.startsWith('_')) continue;
+      const path = join(dirPath, file);
+      total++;
+      byDir[dir].n++;
+      try {
+        const violations = validate(parseNote(readFileSync(path, 'utf-8')), slugFromPath(path), dirType);
+        if (violations.length === 0) {
+          conformant++;
+          byDir[dir].ok++;
+        } else {
+          for (const v of violations) {
+            const key = `${v.key} — ${v.problem}`;
+            violationCounts[key] = (violationCounts[key] || 0) + 1;
+          }
+        }
+      } catch {
+        violationCounts['unparseable frontmatter'] = (violationCounts['unparseable frontmatter'] || 0) + 1;
+      }
+    }
+  }
+
+  const nonConformant = total - conformant;
+  const pct = total > 0 ? ((conformant / total) * 100).toFixed(1) : '0.0';
+
+  emitEvent({
+    event: 'doc.integrity.knowledge_conformance',
+    total,
+    conformant,
+    non_conformant: nonConformant,
+    conformance_pct: Number(pct),
+    per_dir: byDir,
+    top_violations: Object.entries(violationCounts)
+      .sort((a, b) => b[1] - a[1])
+      .slice(0, 5)
+      .map(([problem, count]) => ({ problem, count })),
+    ok: nonConformant === 0,
+  });
+
+  const elapsed = Date.now() - startTime;
+  if (nonConformant > 0) {
+    console.error(`${TAG} ${nonConformant}/${total} notes off-schema (${pct}% conformant). Repair: bun LIFEOS/TOOLS/MigrateKnowledge.ts`);
+    for (const [problem, count] of Object.entries(violationCounts).sort((a, b) => b[1] - a[1]).slice(0, 3)) {
+      console.error(`${TAG}   ${count}× ${problem}`);
+    }
+  }
+  console.error(`${TAG} === Check complete (${elapsed}ms, ${pct}% conformant) ===`);
+}
+
+// Allow running standalone for verification.
+if (import.meta.main) {
+  handleKnowledgeConformance().catch((err) => {
+    console.error(`${TAG} Fatal:`, err);
+    process.exit(1);
+  });
+}
diff --git a/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts b/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts
new file mode 100644
index 0000000000..2beee6d878
--- /dev/null
+++ b/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts
@@ -0,0 +1,21 @@
+/**
+ * RebuildKnowledgeSchema — regenerate `MEMORY/KNOWLEDGE/_schema.md` from
+ * `KnowledgeSchema.ts` (the pure-data source of truth) on the doc-integrity
+ * pass, so the schema doc never drifts from the schema and exists on every
+ * install. Fire-and-forget; a failure is non-fatal (logged by the caller).
+ *
+ * Runs the standalone generator as a subprocess rather than importing it,
+ * because `GenerateKnowledgeSchemaDoc.ts` executes `main()` on import.
+ */
+import { spawn } from "child_process";
+import { join } from "path";
+import { getLifeosDir } from "../lib/paths";
+
+export async function handleRebuildKnowledgeSchema(): Promise<void> {
+  const generator = join(getLifeosDir(), "TOOLS", "GenerateKnowledgeSchemaDoc.ts");
+  await new Promise<void>((resolve) => {
+    const child = spawn("bun", [generator], { stdio: "ignore" });
+    child.on("close", () => resolve());
+    child.on("error", () => resolve());
+  });
+}
diff --git a/LifeOS/install/hooks/hooks.json b/LifeOS/install/hooks/hooks.json
index ff8b570a12..b1389ff35d 100644
--- a/LifeOS/install/hooks/hooks.json
+++ b/LifeOS/install/hooks/hooks.json
@@ -212,6 +212,16 @@
             "timeout": 8
           }
         ]
+      },
+      {
+        "matcher": "Write|Edit|MultiEdit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "$HOME/.claude/hooks/KnowledgeWriteGuard.hook.ts",
+            "timeout": 5
+          }
+        ]
       }
     ],
     "PostToolUseFailure": [