Durable sessions (step5): keep-running session-host spike (tmux vs psmux)

[DDKinger]

Durable sessions — step5 (spike, stacked on step4)

Base branch: dev/yuazha/durable-workspaces (step4). Docs-only.

Investigation for the hardest durable-sessions requirement — keep running in the background (tmux-style detach/reattach). Adds doc/specs/durable-sessions-keep-running-spike.md.

Findings (both verified live on a dev machine)

• Native tmux on Windows: not viable. POSIX-only; runs only under WSL/Cygwin/MSYS2, and a WSL tmux can't own native Windows shells. tmux -CC control mode is iTerm2/macOS-only — no Windows terminal ships a -CC client.
• psmux is viable (native Windows, Rust, ConPTY, MIT, tmux-compatible). Verified: a detached session survives its creator (new-session -d → ls still lists it), and psmux speaks the tmux control protocol (psmux -CC emits %begin/%window-add). It is the "persistent local session host" the spec describes, and it already exposes the -CC transport we'd attach/detach over.

Recommendation

Adopt psmux as the keep-running session host; prototype WT as a psmux -CC control-mode client (modeled on iTerm2's tmux integration, reusing our ConPTY/TermControl + per-tab routing), gated behind the "continue running commands" startup setting. A transparent session-wrapping fallback (Option B) is documented for a faster proof of the detach/reattach lifetime.

[github-actions]

@check-spelling-bot Report

⚠️ Dictionary not found

Problems were encountered retrieving check dictionaries (cspell:cpp/src/lang-jargon.txt cspell:public-licenses/src/generated/public-licenses.txt cspell:node/dict/node.txt cspell:golang/dict/go.txt cspell:scala/dict/scala.txt cspell:clojure/src/clojure.txt cspell:elixir/dict/elixir.txt cspell:python/src/python/python-lib.txt cspell:python/src/python/python.txt cspell:monkeyc/src/monkeyc_keywords.txt cspell:cpp/src/ecosystem.txt cspell:sql/src/tsql.txt cspell:swift/src/swift.txt cspell:php/dict/php.txt cspell:lua/dict/lua.txt cspell:k8s/dict/k8s.txt cspell:npm/dict/npm.txt cspell:software-terms/dict/webServices.txt cspell:rust/dict/rust.txt cspell:cpp/src/people.txt cspell:latex/dict/latex.txt cspell:redis/dict/redis.txt cspell:java/src/java-terms.txt cspell:cpp/src/compiler-gcc.txt cspell:powershell/dict/powershell.txt cspell:css/dict/css.txt cspell:cpp/src/template-strings.txt cspell:html/dict/html.txt cspell:cpp/src/stdlib-cpp.txt cspell:django/dict/django.txt cspell:public-licenses/src/additional-licenses.txt cspell:dart/src/dart.txt cspell:java/src/java.txt cspell:svelte/dict/svelte.txt cspell:python/src/additional_words.txt cspell:fullstack/dict/fullstack.txt cspell:sql/src/sql.txt cspell:typescript/dict/typescript.txt cspell:cpp/src/stdlib-cmath.txt cspell:gaming-terms/dict/gaming-terms.txt cspell:cpp/src/lang-keywords.txt cspell:python/src/common/extra.txt cspell:haskell/dict/haskell.txt cspell:dotnet/dict/dotnet.txt cspell:cpp/src/compiler-clang-attributes.txt cspell:ada/dict/ada.txt cspell:cpp/src/compiler-msvc.txt cspell:shell/dict/shell-all-words.txt cspell:software-terms/dict/softwareTerms.txt cspell:ruby/dict/ruby.txt cspell:docker/src/docker-words.txt cspell:r/src/r.txt cspell:cpp/src/stdlib-c.txt cspell:cpp/src/stdlib-cerrno.txt).

⚠️ For more information, see check-dictionary-not-found.

🔴 Please review

See the 📂 files view, the 📜action log, 👼 SARIF report, or 📝 job summary for details.

Unrecognized words (4)

marlocarlo
psmux
shellsession
vendoring

These words are not needed and should be removed

AHP Backgrounder CANTCALLOUT Ccc cplusplus ctl Debian dotnet drv endptr EOFs evt Fullwidth gitlab hdr idl IME inbox ININPUTSYNCCALL INJ intelligentterminal Ioctl KVM lbl lld lsb NODEFAULT NONINFRINGEMENT notif oss outdir Podcast pri prioritization rcv segfault SND sourced SWP Tbl testname transitioning unk unparseable unregisters Virt VMs webpage websites WINVER xsi

To accept these unrecognized words as correct and remove the previously acknowledged and now absent words, you could run the following commands

... in a clone of the git@github.com:microsoft/intelligent-terminal.git repository
on the dev/yuazha/durable-keeprunning-spike branch (ℹ️ how do I use this?):

curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/cfb6f7e75bbfc89c71eaa30366d0c166f1bd9c8c/apply.pl' |
perl - 'https://github.com/microsoft/intelligent-terminal/actions/runs/29626926862/attempts/1' &&
git commit -m 'Update check-spelling metadata'

Available 📚 dictionaries could cover words (expected and unrecognized) not in the 📘 dictionary

This includes both expected items (2090) from .github/actions/spelling/expect/alphabet.txt .github/actions/spelling/expect/expect.txt .github/actions/spelling/expect/web.txt and unrecognized words (4)

Dictionary	Entries	Covers	Uniquely
cspell:csharp/csharp.txt	32	2	2
cspell:aws/aws.txt	232	2	2
cspell:fonts/fonts.txt	536	1	1

Consider adding to the extra_dictionaries array (in the .github/actions/spelling/config.json file):

    "cspell:csharp/csharp.txt",
    "cspell:aws/aws.txt",
    "cspell:fonts/fonts.txt",

To stop checking additional dictionaries, put (in the .github/actions/spelling/config.json file):

"check_extra_dictionaries": []

Warnings ⚠️ (1)

See the 📂 files view, the 📜action log, 👼 SARIF report, or 📝 job summary for details.

⚠️ Warnings	Count
⚠️ check-dictionary-not-found	54

See ⚠️ Event descriptions for more information.

✏️ Contributor please read this

By default the command suggestion will generate a file named based on your commit. That's generally ok as long as you add the file to your commit. Someone can reorganize it later.

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