Epic: POST feature overhaul — responsive layout, analytics, spaced repetition, adaptive difficulty & Morse improvements

[atomantic]

POST ("Power On Self Test" / Physical Observation & Screening Tests) is one of PortOS's richest single-user features — 5 cognitive domains (Mental Math, Memory, Wordplay, Verbal Agility, Imagination), plus standalone Wordplay, Morse, and Memory (Elements Song) trainers. But the UI under-uses desktop width, hides most of the data it already computes, and lacks the adaptive/scheduling mechanics that make a daily-practice tool actually stick.

This epic tracks a coordinated pass across three fronts.

Audit findings

1. Responsive design (core complaint). Almost every POST surface hard-caps its own width and stacks a single column:

• PostSessionLauncher.jsx:125 max-w-2xl · PostDrillConfig.jsx:178 max-w-2xl · MemoryBuilder.jsx:117 max-w-2xl · MemoryPractice.jsx max-w-2xl · PostSessionResults.jsx:18 max-w-2xl · PostHistory.jsx:44 max-w-3xl. Live drill runners use the narrower max-w-lg (intentional focus view — leave those).
• MorseTrainer.jsx:354 is the only surface with a real responsive multi-column layout (grid xl:grid-cols-[minmax(0,1fr)_24rem] + sticky sidebar). Use it as the pattern to replicate.
• The page shell (pages/Post.jsx) already gives full width via flex-1 overflow-auto p-6; every child re-caps itself, leaving large empty gutters on desktop.

2. Under-surfaced data (actionability gap). The server already computes per-domain averages, per-drill averages, current/longest streaks (getPostStats, computePostStreaks in meatspacePost.js), per-drill accuracy + practice streaks (getTrainingStats in meatspacePostTraining.js), and chunk/element-level memory mastery (meatspacePostMemory.js). None of it reaches the launcher — which shows only "Today's Status" + the last 3 raw scores. The analytics only appear on the dashboard DailyPostWidget.

3. Missing training mechanics.

• No spaced repetition — memory items track mastery but there is no nextReview/interval/Leitner scheduling; nothing tells you what is due today.
• No adaptive difficulty — drill configs are fixed steps/count/timeLimitSec, never adjusting to performance.
• No reminders/scheduling for the daily habit.

4. Config gap. PostDrillConfig.jsx exposes only 5 of the 14 LLM drill types defined in constants.js / meatspacePostLlm.js (the imagination set and compound-chain/bridge-word/double-meaning/idiom-twist are generatable server-side but have no config UI).

5. Morse is under-built vs siblings. It has no deep-linkable sub-pages (modes/reference tabs live in local state, not the URL — violates the repo's "URL is the source of truth for what's open" rule), and its Tree reference view renders confusingly / appears incomplete — the depth-aligned flex layout makes the DIT (E) subtree render sparse and misplaces the start node under the "DIT" header, so it reads as missing letters even though all 41 chars are in the data.

Child issues

Responsive (per-surface):

• POST launcher: responsive redesign to use full desktop width #1986 Launcher responsive redesign
• POST config: responsive multi-column layout + expose all 14 LLM drill types #1987 Config responsive + expose all 14 LLM drill types
• POST history: responsive analytics dashboard surfacing per-domain/per-drill stats #1988 History → responsive analytics dashboard
• POST memory: responsive layouts for Memory Builder, Practice & Results #1989 Memory Builder / Practice / Results responsive layout

Actionability & training mechanics:

• POST launcher: surface progress analytics (streaks, per-domain, weakest-domain focus) #1990 Surface progress analytics on the launcher (streaks, per-domain, weakest-domain)
• POST: spaced-repetition scheduling for memory items (due-today) #1991 Spaced-repetition scheduling ("due today")
• POST: adaptive difficulty based on recent performance #1992 Adaptive difficulty
• POST: add deterministic cognitive drills (n-back, digit span, Stroop, Schulte) #1993 New deterministic drill types (n-back, digit-span, Stroop, Schulte)
• POST: optional daily reminder / scheduling nudge #1994 Daily reminders & scheduling nudges

Morse:

• POST Morse: deep-linkable sub-pages for modes & reference tabs #1995 Morse: deep-linkable sub-pages (routed modes + reference tabs)
• POST Morse: Tree reference renders incomplete/misaligned #1996 Morse: fix Tree reference (appears incomplete / misaligned)
• POST Morse: trainer improvements (progress persistence, new practice modes) #1997 Morse: trainer improvements

Close this epic when all children are done.