revert(pi-tui): restore upstream differential rendering behavior

.changeset/cli-revert-rendering.md

@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Revert the recent TUI transcript rendering changes to the original upstream behavior while rendering issues are reworked.

.changeset/pi-tui-revert-rendering.md

@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/pi-tui": patch
+---
+
+Revert the fork's viewport and scrollback rendering patches, restoring the upstream differential-rendering behavior. The narrow-terminal fixes (width clamping, overwide-line truncation) are kept.

.changeset/web-thinking-effort-levels.md

@@ -1,5 +1,5 @@
 ---
-"@moonshot-ai/kimi-code": minor
+"@moonshot-ai/kimi-code": patch
 ---
 
 Add a segmented thinking-level control in the web model picker for models that support multiple reasoning efforts. Open the composer model menu to choose a level.

packages/pi-tui/AGENTS.md

@@ -1,6 +1,6 @@
 # pi-tui Agent Guide
 
-`packages/pi-tui` is a vendored copy of pi-tui from the upstream pi-mono project (baseline: upstream 0.80.2, see commit `7859b0af`). It is no longer patched via pnpm patches — all local fixes are applied directly to the source.
+`packages/pi-tui` is a vendored copy of pi-tui from the upstream pi-mono project (baseline: upstream 0.80.2, see commit `7859b0af`). It is no longer patched via pnpm patches — all local fixes are applied directly to the source. The differential-rendering behavior in `src/tui.ts` matches upstream: the fork's viewport/scrollback rendering patches were reverted; the only remaining divergences are listed below.
 
 ## Local divergences from upstream (must be preserved on every re-vendor)
 
@@ -17,6 +17,5 @@ Never overwrite this directory wholesale when syncing from upstream. Each of the
 
 ## Testing
 
-- This package's tests run with `node --test` (`pnpm --filter @moonshot-ai/pi-tui test`), not vitest; the root `vitest run` does not execute them — CI covers them through the dedicated `test-pi-tui` job in `.github/workflows/ci.yml`. The `test` script runs both `test/*.test.ts` and `e2e/*.test.ts`; `test:e2e` runs the e2e cases alone.
+- This package's tests run with `node --test` (`pnpm --filter @moonshot-ai/pi-tui test`), not vitest; the root `vitest run` does not execute them — CI covers them through the dedicated `test-pi-tui` job in `.github/workflows/ci.yml`.
 - Prefer adding new narrow-width tests to the existing test file of the corresponding component.
-- `e2e/` is a rendering-bug ledger: one case file per production rendering bug, driven end to end through the xterm-emulated `VirtualTerminal` (screen, scrollback, scroll position). When a rendering bug is found, add a `caseNN-*.test.ts` repro there and register it in `e2e/README.md`; keep it as a permanent regression guard after the fix. See `e2e/README.md` for the renderer invariants these cases assert.