[gh-8226] Spec: open dir in external editor from tab + file tree menus

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Summary

Add PRODUCT.md and TECH.md for a feature-flagged "Open with " item on two existing right-click context menus — session tabs and file-tree directory headers. The menu label is rendered from the user's existing code.editor.open_file_editor setting; no editor is hardcoded. No code changes in this PR.

Motivation

Issue #8226 asks for a way to open a directory in $EDITOR from Warp. Today's "Open in editor" plumbing supports files only; there is no fast path from "this tab represents a project" or "this is a folder in the file tree" to "open this folder in my editor." This spec defines one of three complementary UX entry points discussed on the issue (the other two — click-on-output and prompt-area chip — remain out of scope and are tracked separately).

What's changed

• specs/gh-8226-open-with-editor/PRODUCT.md — Summary / Problem / Non-goals / Behavior (8 numbered points) / Validation.
• specs/gh-8226-open-with-editor/TECH.md — Anchors in current code (with file:line refs to external_editor/mod.rs, tab.rs, code/file_tree/view.rs), proposed changes (new open_directory_in_external_editor + per-platform impls, new FeatureFlag::OpenDirectoryInExternalEditor, two new action variants, shared label helper), testing notes, rollout.

Out of scope

• Hijacking clicks on directory paths printed inside terminal output (the original ask in this issue).
• Prompt-area "Open in IDE" chip (@ATERCATES's prototype on a fork).
• Warp Drive workspace switcher (app/src/drive/index.rs render_workspace_picker) — cloud entities have no local cwd.
• SSH / remote terminal paths.
• Line/column positioning (directories have no caret).

Validation

Documentation-only PR. The validation cases that the implementation PR will exercise are listed in PRODUCT.md § Validation:

• Editor setting changes update the label on next menu open.
• EditorChoice::Warp omits the item.
• EditorChoice::EnvEditor with empty \$EDITOR omits the item.
• File-tree remote entries omit the item (matches existing "Reveal in Finder" treatment).
• Feature flag off → both menus are byte-for-byte unchanged from current master.

Related issues

• Closes part of Add option to open directories in $EDITOR #8226 (the tab + file-tree right-click UX vector). The other two UX vectors discussed on that issue remain open.

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[oz-for-oss]

@0xBB2B

Every PR must be linked to a same-repo issue before Oz can review it.

Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-spec when it is ready. Once it is marked, comment /oz-review to re-trigger review.

See the contribution guidelines for the full readiness model.

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