build: migrate JavaScript tooling to pnpm 11 - #1792

Match the package scripts and exact pnpm pin introduced by #1792. Document pnpm installation and use frozen installs and project-local commands throughout the Interactive validation guide.

* Add persistent multi-session R Interactive with rich output

Implement independent plain R and arf agents, durable replay, native console control, session-bound language services, rich renderers, and notebook export. Include macOS storage and virtual-cell lint cache fixes with regression coverage.

* Improve Interactive session controls, history, and output reliability

* Document Positron workflow comparison and Interactive validation matrix

* Fix output updates for queued Interactive cells

* Compress and reclaim persistent Interactive plot snapshots

* Open the Interactive session picker from the Command Palette

* Hide stale Interactive sessions and clarify attached session status

* Use compact Interactive toolbars and an accessible plot save menu

* Expose session controls in the native Interactive toolbar

* Format inline numeric tables with R print options

* Improve Interactive export, lifecycle notices, and execution target selection

* Preserve R Interactive sessions and views across reload and restart

* Refresh Interactive kernel status and simplify session chooser

* Fix Interactive widgets, history exports and virtual-cell diagnostics

* Trim Interactive error traces and document live validation

* Fix Interactive cell actions, error messages and new-session focus

* Keep Workspace viewer aligned with Interactive session focus

* Clarify Interactive connection status and add bulk session stopping

* Show Interactive session ages and improve input language features

* Handle optional arf availability before creating or restarting Interactive sessions

* Simplify Interactive provider picker labels and show executable paths

* Make Workspace dialog tests portable and retain CI failure logs

* Fix Remote SSH Interactive startup and temporary-session diagnostics

* Preserve titles and axes across Interactive plot panels

* Preserve Interactive R libraries and correct plot rendering

* Record public example and fallback validation results

* Load processx runtime dependency in isolated renv sessions

* Page Interactive plots and retain switchable R table printouts

* Capture printed table snapshots with portable line endings

* Support persistent Interactive sessions without tmux

* Preserve research results and correct fallback plot pagination

* Bound Interactive table snapshots and avoid full dataset copies

* Add on-demand browsing and query controls to inline tables

* Remove the inline table Columns panel

* Fall back to compatible R-universe sess packages when source installation fails

* Make binary installer fixtures portable across hosts and versions

* Use repository archive names for Linux installer fixtures

* Protect Interactive replay and native console connections

Deliver replayed events before buffered live output, reject oversized rich events before IPC framing, and keep forked R workers off the parent console socket. Add regressions for all three failures.

* Allow cancelling slow Interactive inspection requests

Send interrupts even when no submitted cell is running, and return an interrupted RPC response without unwinding the R polling loop. Cover cancellation before and after the inspection timeout, followed by successful execution and inspection.

* Fix Interactive output regressions found in public R examples

* fix: bind Interactive language servers to their owning sessions

* Refactor Interactive runtimes behind a session backend

Separate execution policy and persistence from sess/arf transports, graphics,
process lifecycle and runtime preparation. Preserve legacy configs and keep
agent bundles independent of the sess cache.

Fix inherited drafts in fresh native windows, stale saved URI ownership,
and inconsistent observer execution errors. Cover early Stop, adopted
frontend disposal, ambiguous dispatch and late process-exit events.

* Fix Windows CI for Unix-only Interactive backend tests

Keep backend configuration checks platform-independent and restrict socket-based agent contract tests to supported hosts.

* Allow build and test scripts to run without pnpm on PATH

Invoke local build tools directly while retaining pnpm dependency installation and CI. Document the pinned pnpm setup and npm script compatibility.

* Restore pnpm workflow and align Interactive development instructions

Match the package scripts and exact pnpm pin introduced by #1792. Document pnpm installation and use frozen installs and project-local commands throughout the Interactive validation guide.

* Keep Interactive host settings local and clarify arf adoption

Exclude host paths, runtime choices, and resource budgets from Settings Sync by default. Describe existing arf adoption independently of the terminal or session manager that launched it.

* Use VS Code runtime and keep Interactive entry points private

Remove the Node path setting, scope Electron Node mode to agent launches, and mark Interactive settings experimental. Verify private sess calls and full editor quit/reconnect across versions.

* Keep native platform in Interactive process tests

* Use consistent namespace syntax for sess internals

* Configure interactive retention limits in MiB

* Restore optional Node runtime override for Interactive

* Fix Node override checks for tmux session launches

* Move Interactive user documentation to the wiki