lesson 5: accusative adjective endings, scored 7/10

Covers weak/mixed/strong declension for accusative adjectives. Learning
record captures the two real misconceptions found: reaching for -es after
a der-word (only valid in mixed/strong declension), and E-Mail's gender
missed a second time despite an earlier correction.

learning-records/0005-accusative-adjective-endings-7-of-10.md

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+# Accusative Adjective Endings: 7/10 — One Clear Misconception Found
+
+Missed 3 of 10 on the lesson 5 drill. Two of the three errors point to the same misconception rather than
+random slips.
+
+**The declension-type mixup (Q6, Q9):** Both misses used the ending *-es* after a der-word — *das alte Auto*
+answered as *altes*, and *den teuren Kostenvoranschlag* answered as *teures*. *-es* is a mixed/strong
+declension ending (neuter, used only when nothing else marks the noun as neuter). It never appears in weak
+declension, where the only two options are *-e* and *-en* — the der-word (*das*, *den*) already marks gender
+and case, so the adjective doesn't need to repeat the signal.
+
+**The gender miss (Q5):** *eine nette E-Mail* was answered as *einen netten*, treating *E-Mail* as masculine.
+This is the same slip flagged in the diagnostic session (0003-diagnostic-session-gaps.md) — *E-Mail* is a
+memorize-only noun that has now failed twice under production pressure despite the correction being given
+each time.
+
+**Implications:** The next adjective-endings pass should call out the weak-declension rule explicitly —
+"after der/die/das, the only two endings that exist are -e and -en; -es is never one of them" — as its own
+line, not just something implied by the table. *E-Mail*'s gender needs deliberate spaced repetition (flashcard
+style); two incidental exposures haven't fixed it, so it likely needs a short, focused noun-gender refresh
+revisiting the lesson 2 gap rather than more incidental exposure in unrelated lessons.