diff --git a/platform/api/Dockerfile b/platform/api/Dockerfile
index 5bb1795..92d71cf 100644
--- a/platform/api/Dockerfile
+++ b/platform/api/Dockerfile
@@ -33,6 +33,10 @@ COPY platform/api/migrate-sqlite.js ./
 # listing/progress-shaping (never executed; setup/validate/teardown stay Lab-only).
 COPY scenarios/ ./scenarios/
 
+# Phase 6A — course/module lesson prose (content.js). Git-tracked Markdown, read-only, same
+# reasoning as scenarios/ above: this image only ever reads it, never executes anything from it.
+COPY content/ ./content/
+
 # Platform-shell + admin frontend, built in the stage above — served statically, no nginx
 # needed for a lightweight Node API+static server.
 COPY --from=frontend-build /fe/dist/ /frontend-dist/
diff --git a/platform/api/src/admin-course-routes.js b/platform/api/src/admin-course-routes.js
new file mode 100644
index 0000000..6abddf8
--- /dev/null
+++ b/platform/api/src/admin-course-routes.js
@@ -0,0 +1,42 @@
+// Phase 6A §7 — instructor/admin curriculum visibility. Read-only: course/module/activity
+// authoring stays Git/migration-based this phase (see docs/COURSE_CONTENT_MODEL.md — no
+// WYSIWYG CMS), so there is deliberately no POST/PATCH here, only the views an instructor needs
+// to actually teach from: program structure with instructor notes, and per-student progress
+// through it so a teacher can see where someone is stuck.
+
+const { buildCourseTree } = require('./course-progress');
+
+module.exports = function registerAdminCourseRoutes(app, deps) {
+  const { instructorSession, rbac, getPool } = deps;
+  const { requireAnyInstructor, requireStudentRelationshipAccess } = rbac;
+
+  // Same local-wrap convention as admin-programs-routes.js/admin-learning-routes.js — RBAC
+  // middleware here is plain sync `(req,res,next)`, so this Promise.resolve() guard lets it
+  // share the same mw.map(wrap) list as the async route handlers below.
+  function wrap(fn) {
+    return (req, res, next) => { Promise.resolve(fn(req, res, next)).catch(next); };
+  }
+  const admin = { get: (p, ...mw) => app.get(p, instructorSession, ...mw.map(wrap)) };
+
+  // Full structure (courses -> modules -> activities), instructor notes and draft content
+  // included, with no completion overlay — studentId is deliberately null here (course-
+  // progress.js's queries tolerate that and just return complete:false everywhere), since this
+  // is "what does the curriculum look like," not "how is any one student doing."
+  admin.get('/api/admin/programs/:programId/courses', requireAnyInstructor, async (req, res) => {
+    const courses = await buildCourseTree(getPool(), { studentId: null, programId: req.params.programId, forInstructor: true });
+    res.json(courses);
+  });
+
+  // One student's real progress through the same tree. Uses requireStudentRelationshipAccess,
+  // not requireStudentCohortAccess — a self-paced root_ student typically has NO cohort at all
+  // (Phase 5B), so the cohort-only check would 403 a plain instructor out of every self-paced
+  // student's progress. Same rule Phase 5C's notification routes already established: a plain
+  // instructor may see a student they share a cohort with OR whose enrollment they personally
+  // created; owner/admin always bypass.
+  admin.get('/api/admin/students/:id/courses', requireAnyInstructor, requireStudentRelationshipAccess('id'), async (req, res) => {
+    const programId = req.query.program_id;
+    if (!programId) return res.status(400).json({ error: 'program_id is required' });
+    const courses = await buildCourseTree(getPool(), { studentId: req.params.id, programId, forInstructor: true });
+    res.json(courses);
+  });
+};
diff --git a/platform/api/src/course-routes.js b/platform/api/src/course-routes.js
new file mode 100644
index 0000000..e2d1722
--- /dev/null
+++ b/platform/api/src/course-routes.js
@@ -0,0 +1,60 @@
+// Phase 6A §6 — student-facing course/module/activity API. Mounted alongside
+// selfpaced-routes.js (My Programs) — a course tree is always viewed THROUGH an enrollment the
+// student actually holds, never a public catalog, same boundary selfpaced-routes.js already
+// established for programs themselves.
+
+const enrollment = require('./enrollment');
+const { buildCourseTree, findResumeTarget } = require('./course-progress');
+
+module.exports = function registerCourseRoutes(app, deps) {
+  const { studentSession, getPool, wrap } = deps;
+
+  // The full course/module/activity tree for one enrollment, with real completion + locking.
+  app.get('/api/student/programs/:enrollmentId/courses', studentSession, wrap(async (req, res) => {
+    const row = await enrollment.getEnrollment(getPool(), req.params.enrollmentId);
+    if (!row || row.student_id !== req.studentId) return res.status(404).json({ error: 'not_found' });
+    const courses = await buildCourseTree(getPool(), { studentId: req.studentId, programId: row.program_id, forInstructor: false });
+    res.json({ courses, resume: findResumeTarget(courses) });
+  }));
+
+  // Phase 5B §9's rule applies here too: an activity is only ever reachable through an
+  // enrollment the student actually holds — resolved server-side from the activity's own
+  // course, never trusted from anything the client asserts about which program it belongs to.
+  async function requireEnrolledActivity(req, res) {
+    const pool = getPool();
+    const { rows } = await pool.query(
+      `SELECT ma.*, c.program_id FROM module_activities ma
+       JOIN course_modules cm ON cm.module_id = ma.module_id
+       JOIN courses c ON c.course_id = cm.course_id
+       WHERE ma.activity_id = $1 AND ma.visibility = 'published'`,
+      [req.params.activityId]
+    );
+    const activity = rows[0];
+    if (!activity) { res.status(404).json({ error: 'not_found' }); return null; }
+    const { rowCount } = await pool.query(
+      `SELECT 1 FROM enrollments WHERE student_id = $1 AND program_id = $2 AND status = 'active'`,
+      [req.studentId, activity.program_id]
+    );
+    if (!rowCount) { res.status(403).json({ error: 'not_entitled' }); return null; }
+    return activity;
+  }
+
+  // §9 — the explicit completion marker, valid ONLY for lesson-only ('manual_marker') activity
+  // types. A 'lab' or 'assessment'/'capstone' activity's completion is derived automatically
+  // (course-progress.js) and can never be set this way — marking one "complete" here would be a
+  // second, forgeable source of truth for something the platform already knows how to verify
+  // for real.
+  app.post('/api/student/activities/:activityId/complete', studentSession, wrap(async (req, res) => {
+    const activity = await requireEnrolledActivity(req, res);
+    if (!activity) return;
+    if (activity.completion_behavior !== 'manual_marker') {
+      return res.status(409).json({ error: 'not_manually_completable', message: 'This activity\'s completion is derived automatically.' });
+    }
+    await getPool().query(
+      `INSERT INTO activity_completions (student_id, activity_id) VALUES ($1, $2)
+       ON CONFLICT (student_id, activity_id) DO NOTHING`,
+      [req.studentId, activity.activity_id]
+    );
+    res.json({ ok: true });
+  }));
+};
diff --git a/platform/api/src/server.js b/platform/api/src/server.js
index ea76b1b..6b144f8 100644
--- a/platform/api/src/server.js
+++ b/platform/api/src/server.js
@@ -395,6 +395,16 @@ require('./admin-programs-routes')(app, {
 });
 require('./integration-routes')(app, { getPool, recordAudit, wrap });
 
+// Phase 6A — course/module/activity content model, layered on top of the existing
+// scenario/assessment/achievement systems (never a duplicate of them — see
+// docs/COURSE_CONTENT_MODEL.md). course-routes.js is the student-facing half (course tree
+// through an enrollment, lesson completion marker); admin-course-routes.js is the instructor
+// curriculum view (structure + per-student progress).
+require('./course-routes')(app, { studentSession, getPool, wrap });
+require('./admin-course-routes')(app, {
+  instructorSession: wrap(instructorSession), rbac, getPool,
+});
+
 // Phase 5C — enrollment operations & communications. notification-routes.js is the
 // instructor/admin half (list, per-student view, resend-activation, send-enrollment-
 // confirmation); the actual delivery worker starts in main() below, alongside the existing