docs(docs): add strategy, coding, and system design documentation hierarchy

docs/content/03-schedule/week-7.mdx

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+---
+title: 'Week 7'
+description: 'Top-target onsites. Keep coding light. Coinbase last.'
+sidebar:
+  icon: building-2
+---
+
+**September 28 – October 4, 2026.** Run the top-target onsites. Keep coding light. Interview with Coinbase last.
+
+## Goals
+
+- [ ] Keep coding light: 1 to 2 timed problems each day.
+- [ ] Run the Plaid, Circle, and Stripe onsites.
+- [ ] Run the Coinbase onsite on Friday.
+- [ ] Rest before each onsite.
+
+:::note[Schedule shift]
+Coding stays light this week. Solve 1 to 2 timed problems each day as a warm-up only. Spend the day on onsite prep and the onsites.
+:::
+
+## Daily schedule
+
+| Day | Coding — light | Prep — B4 | Pipeline |
+|---|---|---|---|
+| Mon | 2 timed Coinbase-tagged problems: matching, balance accounting, and event sourcing | Tough-tradeoffs stories, plus Base L2 and AI-fluency prep | Plaid onsite |
+| Tue | 2 timed mixed problems | Circle pair-programming warm-up: narrate a live build | Circle onsite |
+| Wed | Stripe-format practical only | Integration dry run: an unfamiliar API, 45 minutes | Stripe onsite |
+| Thu | 1 timed warm-up problem | Final founder-narrative pass. Sleep early. | — |
+| Fri | 1 timed warm-up problem only | — | **Coinbase onsite** |
+| Sat | Off | Write the negotiation-lever notes, per company | Tell all loops: "consolidating by October 16" |
+
+## No gate this week
+
+:::danger[Coinbase last]
+Interview with Coinbase last. Run the Coinbase onsite on Friday, after the other top targets.
+:::
+
+## Outputs
+
+- Onsites at Plaid, Circle, Stripe, and Coinbase.
+- The negotiation-lever notes, per company.
+- All loops told the decision date: October 16.