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+# Session view resizing and summary layout
+
+**Date:** 2026-07-23  
+**Status:** Approved design, pending implementation
+
+## Goal
+
+Make the read-only session view easier to inspect by allowing the document panel to
+occupy up to half of the available application width and by presenting the persisted
+session outcome in task-oriented order.
+
+## Session panel resizing
+
+- Add a dedicated vertical separator between `SessionDocumentsPanel` and the area to
+  its right. It must not reuse or interfere with the Model activity separator.
+- On desktop, pointer dragging can resize the session panel from its minimum usable
+  width up to exactly 50% of the measured application container.
+- Preserve at least 512 px for the area to the right when the container is too narrow
+  for a 50/50 split.
+- Support keyboard resizing with arrow keys, `Home`, and `End`, expose the current
+  bounds through separator ARIA attributes, and persist the chosen width in local
+  storage under a session-panel-specific key.
+- On layouts where a desktop split is not usable, do not show an interactive divider.
+
+## Summary document contract
+
+The harness remains the source of truth for ordering and semantic projection. Both
+filesystem and repository-backed snapshots must produce the same ordered document
+bundle:
+
+1. Original question.
+2. Final SQL.
+3. Data preview.
+4. Revised question.
+5. Assumptions.
+6. Memories.
+7. Remaining useful technical documents, such as schema linking and validation
+   details not already represented by the preview.
+
+Missing artifacts are omitted without changing the relative order of those present.
+
+### Final SQL
+
+- Render the persisted `sql_final` artifact immediately after the original question.
+- Show an always-available copy button with an accessible label.
+- Copy the exact SQL text to the clipboard and provide visible success/failure
+  feedback without modifying the SQL.
+
+### Preview
+
+- Derive the preview from the persisted validation report produced during finalization;
+  do not rerun the SQL when opening a session.
+- Present the preview as its own Markdown/table document immediately after Final SQL.
+- Keep execution metadata that belongs to the preview, while excluding unrelated
+  validation-report sections from this position.
+
+### Revised question and assumptions
+
+- Split the persisted `question` artifact at its Assumptions heading.
+- Render the rewritten question as real Markdown, with heading and list structure
+  preserved, after the preview.
+- Render assumptions as their own Markdown section immediately after the rewritten
+  question. If there are no assumptions, omit the section.
+
+### Memories and decision filtering
+
+- Build one memory list from effective ledger decisions.
+- List approved entries first (`memory_promoted`), followed by declined entries
+  (`memory_promotion_declined` and legacy `memory_rejected` where present).
+- Each entry exposes a human-readable subject and detail/rationale; raw decision-type
+  chips are not shown in the memory list.
+- Remove these decisions from the generic Decisions document because they are shown
+  in Memories.
+- Never render `phase_approved`, `table_approved`, `table_promoted`, or
+  `column_promoted` in the session summary.
+- Other meaningful decision types may remain in the generic Decisions document.
+
+## Component boundaries
+
+- `harness/tht/session/store.py`: pure projection helpers for question sections,
+  preview extraction, decision filtering/grouping, and ordered document construction.
+- `frontend/src/shell/SessionDocumentsPanel.tsx`: rendering only; receives the ordered
+  documents and adds the session-panel resize width.
+- A session-panel-specific resize hook owns measurement, bounds, pointer/keyboard
+  behavior, and persistence. Shared pure resize math may be reused from the activity
+  panel where doing so does not couple their state.
+- `SqlViewer` owns the SQL copy control so every Final SQL rendering has the same
+  accessible behavior.
+
+## Failure handling
+
+- Malformed Markdown or legacy decision lines degrade within the existing per-document
+  error boundary and do not blank the session panel.
+- Clipboard rejection leaves the SQL visible and reports that copying failed.
+- A validation report without a preview heading produces no Preview document.
+- Legacy sessions with a combined revised-question/assumptions artifact are split at
+  read time; their persisted content is never rewritten.
+
+## Testing
+
+- Harness tests pin identical ordering for filesystem and snapshot document builders,
+  preview/question splitting, decision suppression, and approved-before-declined
+  memory ordering.
+- Frontend tests pin session-panel resizing to the 50% bound, pointer and keyboard
+  behavior, exact section order, formatted revised-question Markdown, the unified
+  memory list, hidden decision types, and clipboard success/failure behavior.
+- Run the full harness suite, full frontend suite, TypeScript check, production build,
+  Ruff, Pi gate tests, and `git diff --check` before completion.