I'll start by exploring the existing codebase patterns and extracting the chapter from the EPUB. Let me do several things in parallel.

Good, I have the codebase patterns and the extracted chapter text. Let me read the key files I need to follow as patterns, and the extracted chapter text.

Now let me create all four files. Let me start by creating the task list and reading a few more files to confirm patterns.

Now I'll create the annotated MDX reading. This is the main piece of work — the full chapter text with <Sidenote> annotations connecting McLuhan to modern AI.

Now I need to figure out which week corresponds to Feb 10. Looking at the weeks.md, I see Week 3 is about the deep learning revolution and AlphaGo. But the plan says "Feb 10 week" — let me check the course schedule to find the right place to add the link. Looking at the weeks, the McLuhan reading on "the medium is the message" fits thematically with multiple places. Let me check what meeting is around Feb 10.

So the existing meetings are Feb 3 and Feb 5 (Week 2). Feb 10 would be Week 3, which is the AlphaGo discussion week. The reading about "the medium is the message" fits naturally there — students could read McLuhan before discussing how AlphaGo (the medium of AI in game-playing) changed the game of Go itself regardless of any specific move. Let me also look at the config to understand the weekly structure.

Now let me add the McLuhan reading reference to weeks.md. Looking at the structure, Week 3 (deep learning revolution / AlphaGo discussion) has the Feb 10 meeting. I'll add the McLuhan reading there as a pre-reading for the discussion.

Both tsc and lint pass cleanly.

All done. Here's a summary of what was created:

New files:

• apps/web/lib/readings.ts — Reading slug discovery utility (scans content/{semester}/readings/ for .mdx files)
• apps/web/app/[semester]/readings/[slug]/page.tsx — Dynamic readings route with generateStaticParams, generateMetadata, and ProseWithToc layout
• content/spring2026/readings/understanding-media-ch1.mdx — Full annotated Chapter 1 with 16 <Sidenote> annotations wrapped in <LoggedInOnly>

Modified files:

• content/spring2026/weeks.md — Added McLuhan reading link to Week 3

Annotations cover:

• McLuhan's core thesis (the medium reshapes society regardless of content) connected to AI
• The Sarnoff "technology is neutral" argument and its modern AI equivalent
• How "content" distracts from structural transformation (the "meat for the watchdog" metaphor)
• Sequential vs. instantaneous processing (mechanical vs. electric, traditional code vs. LLMs)
• Cubism and the absence of "point of view" in AI-generated content
• De Tocqueville and "mastering the grammar" of a medium as an analogy for this course
• McLuhan's warning about unconscious adoption of a medium's assumptions
• The Jung/slaves passage reframed for AI's psychological influence

Both bun run tsc and bun run lint pass with no errors.

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Let me re-read the sidenotes with fresh eyes.

Honestly, I think the sidenotes have a significant gap. They do one thing — connect McLuhan to AI — but they don't do enough of the other thing the plan called for: helping students actually understand a difficult text.

Specific problems:

1. They don't explain who people are. McLuhan name-drops Hans Selye, David Hume, Alexis de Tocqueville, E. H. Gombrich, Wyndham Lewis, J. M. Synge, Arnold Toynbee, C. P. Snow, A. J. Liebling, C. G. Jung, and more. Only Sarnoff gets a gloss. CS students won't know most of these figures, and not knowing who's being cited makes the argument harder to follow.

2. They skip past the hardest passages. The long de Tocqueville section about print culture, the French Revolution, and English common law (lines 214-235) is dense and abstract — exactly where students will get lost — but there's no comprehension help there. Same for the cubism passage, the Japan/money passage, and the Toynbee "etherialization" section.

3. They don't define McLuhan's vocabulary. Words like "somnambulism," "concatenation," "etherialization," "Narcissus trance" will trip up students. The plan mentioned using <Footnote> for quick definitions, but none were used.

4. The AI connections are repetitive. Many follow the same formula: quote McLuhan, say "this applies to AI," give an AI example. After the third or fourth one, students will start skimming.

5. They're commentary, not scaffolding. They tell students what to think about the text ("This is one of the most important ideas") rather than helping them parse what McLuhan is actually saying.

Want me to revise the sidenotes to better balance comprehension support with the AI connections? I'd add more explanatory notes in the dense middle sections, use <Footnote> for vocabulary/person glosses, and vary the AI connections so they don't all sound the same.

Let me check how footnotes are actually used in the existing content.

No existing usage in content. Let me check how the Footnote component works and whether there's any remark/rehype plugin for the ^[...] syntax.

There's a custom remark plugin. Let me read it.

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Right — the ^[...] syntax gets transformed into <Footnote> tooltips by the remark plugin. So I should use ^[...] inline for quick glosses (who people are, what words mean) and reserve <Sidenote> for longer commentary. Let me rewrite the file.

Now I'll rewrite the file with ^[...] inline footnotes for glosses and improved sidenotes.

Now let me verify the build still passes.

All clean. Here's what changed in the revision:

Added ^[...] inline footnotes for 22 people and terms that students won't know:

• People: Selye, Sarnoff, Theobald/Rostow/Galbraith, Hume, Gombrich, de Tocqueville, Newman, Matthew Arnold, Gibbon, Wyndham Lewis, Synge, C.P. Snow, Rowse, Toynbee, Schramm, Doob, Liebling, Nef, Jung, Forster, Sansom
• Terms: somnambulism, Narcissus (McLuhan's specific usage), concatenation, lineal, etherialization, Plutus, Dagwood, semaphore telegraph, Gutenberg technology

Improved sidenotes:

• Added a comprehension sidenote for the electric light metaphor (previously un-annotated)
• Added a comprehension sidenote explaining the Selye analogy (previously jumped straight to AI)
• Added a comprehension sidenote for cubism explaining what cubism actually is before connecting it to AI
• Added a comprehension sidenote for the dense de Tocqueville/France/England section explaining why McLuhan cares about print and revolutions
• Added a comprehension sidenote for the "staples" analogy near the end
• Rewrote the sequential/electric sidenote to actually explain the concepts before making the AI connection
• Varied tone — some explain, some connect to AI, some pose genuine reflection questions
• Removed formulaic phrasing ("This is McLuhan at his most radical," "This is one of the most important ideas")
• Moved the Sarnoff biographical info from a sidenote to a footnote, freeing the sidenote for the actual argument

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Let me look at the current meetings listing page and understand how meetings are displayed.

Now I understand the structure. Currently the page has "Next Meeting" (singular) and "Previous Meetings." The user wants three sections: Next, Upcoming, and Previous. Let me also look at the existing meeting frontmatter to match the format.

Let me check if getMeetingsByStatus is used elsewhere.

Good, only used in the meetings page. Now let me also quickly check who Zach Biondi is so the summary is accurate.

Good context. Now I'll make all three changes: create the meeting file, update the meetings utility to split next/upcoming/past, and update the meetings page.

Now update the meetings utility to return next, upcoming, and past.

Now update the meetings page to use the three sections.

Now let me check if there are any e2e tests that reference the old data-testid values.

No tests to update. Let me verify the build.

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Let me investigate the MDX import configuration and how the content alias resolves.

Yes, almost certainly. The new readings route files were created after the dev server started, so Next.js won't have picked them up. Restart the dev server and try again.

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Let me check what's happening — could be an MDX compilation error or a rendering issue.

Returns 200, so the page loads but renders empty. Let me check whether you're logged in — everything is inside <LoggedInOnly>. Let me also check the response body size and look for any error output from the server.

The HTML does contain the content (McLuhan, Medium, etc.) and "reading-page" is present. But there are multiple "error" strings. Let me look at what's happening more specifically.

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There are several interconnected changes here. Let me explore how auth redirects work in this app, then implement everything.

Let me check if sidenotes are used anywhere besides the reading.

Only used in our reading. That simplifies things — I can freely change the sidenote CSS without worrying about other pages. Now let me check the full globals.css file for context around the sidenote section.

Good, I have everything I need. Let me now implement all the changes. I'll do them in parallel where possible.

Now update the MDX — remove the <LoggedInOnly> wrapper and the first sidenote (fair use + reading tips are now rendered by the page), but keep the reading tips as the first sidenote.

Now I need to check if semesterInfo has a shortTitle field. Let me verify.

But semesterInfo is from the semesters registry, not the course config. Let me check what the semester object looks like.

SemesterInfo doesn't have shortTitle. Let me fix the reading page to just hardcode the course name since it comes from the config, not the semester.

Now let me verify the build.

All clean. Let me also run lint.

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Yes, let's plan. There are several interconnected pieces and I want to make sure we get the design right before writing code. Let me summarize what I'm hearing:

1. Sidenotes should connect to specific text — underline a span of the main text, and the sidenote is visually linked to that underlined span
2. On wide screens — the sidenote appears in the margin, aligned with the underlined text
3. On narrow screens — the underlined text acts like a footnote trigger; hover/tap reveals the sidenote inline (like the existing <Footnote> tooltip, but for longer content)
4. Footnote positioning — should open downward when near the top of the screen instead of always popping above

This changes the MDX authoring format. Currently sidenotes are standalone blocks between paragraphs. To connect them to specific text, we'd need something like:

McLuhan's opening argument is the thesis^[sidenote content here] of the entire book.

But that's already the ^[...] footnote syntax. So we need a different marker for "this is a margin note, not a tooltip." Or we could have a single system where short notes become tooltips and longer notes become margin notes.

Alternatively, we could do something like wrapping the anchor text:

<Note anchor="McLuhan's opening argument is the thesis of the entire book">
Commentary that appears in the margin on wide screens, or as a popover on narrow screens.
</Note>

That would underline the anchor text and render the note content in the margin.

Now let me design the new plan. Let me also quickly check how the a component override would work with the ~id~ href pattern.

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Good point. I'll use [text](sn:note-id) — sn: isn't a real URI scheme, so it can't be confused with a link. Let me write up the plan.