fix(terminal): keep grid view render-only

[forketyfork]

Solution

Full/grid mode toggles were mutating terminal state even though they are only view changes. That showed up differently across embedded agents: Codex gained blank rows near the input area, while Claude Code reflowed or redrew parts of its chat history.

This keeps Architect-owned resize calls from clearing semantic prompt/input rows, and makes grid view a render-only presentation of the same backing terminal. Grid font scaling and the CWD bar now affect the visible slice of a tile without changing the PTY/VT row and column count. Compact grid tiles follow the active cursor row, so short sessions still show their early output and long sessions stay near the latest prompt.

Fixes #299.

Test plan

• Launch Architect from this branch with at least two sessions.
• Run Codex or Claude Code in one session, generate enough output to fill several rows, then toggle full view in and out several times with Cmd+Return.
• Verify the agent history does not gain blank rows, duplicate tail output, or lose line fragments after toggling.
• Verify the grid tile shows the latest prompt/output after exiting full view.
• Verify a short session with only a few lines of output is still visible in grid view rather than showing an empty tile.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR makes grid/full view toggles render-only so they no longer mutate the underlying PTY/VT terminal dimensions, preventing agent history reflow/blank-row artifacts when switching views.

Changes:

• Stops applying grid-mode “adjusted render height” and grid font scaling to terminal sizing; terminal dimensions are now independent of view mode.
• Updates grid rendering to reserve space for the CWD bar without resizing the terminal, and to render a cursor-following slice of the active screen in compact grid tiles.
• Adds a resize wrapper to preserve semantic prompt/input content during terminal resizes and skips resize work when cols/rows are unchanged.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/ui/components/cwd_bar_metrics.zig	New shared metrics helper for CWD bar sizing.
src/ui/components/cwd_bar.zig	Uses shared CWD bar metrics instead of local constants/helpers.
src/render/renderer.zig	Grid rendering now reserves CWD bar space and follows active cursor row via an offset.
src/app/runtime.zig	Removes view-mode-dependent terminal sizing adjustments; always uses full render height.
src/app/layout.zig	Terminal sizing ignores view mode; terminal resize now preserves semantic prompt and skips redundant resizes.
docs/ARCHITECTURE.md	Documents the new “render-only grid view” and prompt-preserving resize behavior.

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