feat(pwsh): mirror the bash sandbox surface — denial rendering, escalation, and the ConstrainedLanguage contract

tool-pwsh now renders sandbox denial facts (denial marker + same-turn escalation hint, runner-failed notice on background reads) and advertises the sandbox_permissions/justification escalation pair resolved through ctx.approval before execution — the shared fail-closed sequence from dsh-sandbox, with the tool name 'pwsh'. The description teaches the ConstrainedLanguage contract under the Windows sandbox (both confined modes run pwsh in CLM: Add-Type, non-core .NET statics, COM, and reflection fail; the mode cannot be lifted — probe-verified, pinned by LANGMODE assertions in the runner suite and description assertions in the tool suite). The stale pwsh-sandbox JSDoc ('the tool owns approval') and the parity notes' superseded 'minus sandbox' claims are corrected.

.agents/notes/implemented/feature/2026-08-01-pwsh-tool-and-executor.md

@@ -6,14 +6,14 @@ English | [中文](2026-08-01-pwsh-tool-and-executor.zh.md)
 
 ## Problem
 
-The harness spoke one shell dialect on every platform: `bash`. Windows hosts could run it only through WSL or Git-Bash shims, and the shipped `dsh-bash-local` executor is POSIX-only (`bash` hardcoded, process-group semantics POSIX). The Windows roadmap — defaulting hosts to `pwsh`, later pwsh TUI/GUI rendering — had no execution foundation: there was no PowerShell implementation of the bash executor seam and no model-facing tool that taught the PowerShell dialect. The bash tool itself is also far larger than a Windows-first profile needs: background tasks, sandbox escalation, and the persistent-PTY twin are all bash-shaped surface that a minimal `pwsh` tool should not carry.
+The harness spoke one shell dialect on every platform: `bash`. Windows hosts could run it only through WSL or Git-Bash shims, and the shipped `dsh-bash-local` executor is POSIX-only (`bash` hardcoded, process-group semantics POSIX). The Windows roadmap — defaulting hosts to `pwsh`, later pwsh TUI/GUI rendering — had no execution foundation: there was no PowerShell implementation of the bash executor seam and no model-facing tool that taught the PowerShell dialect. The bash tool is also larger than a Windows-first profile strictly needs — the persistent-PTY twin in particular is bash-shaped surface the `pwsh` tool still does not carry. The original minimal profile also left out background tasks and sandbox escalation: background arrived with the [parity decision](2026-08-02-pwsh-tool-bash-parity.md), and the sandbox surface (denial rendering plus `sandbox_permissions` escalation) arrived with the [Windows ACL sandbox decision](2026-08-08-windows-acl-restricted-token-sandbox.md) — the minimal tool was sized for the danger-full-access Windows posture, and that premise ended when the sandbox PR re-enabled confinement and approval on Windows.
 
 ## Decision
 
 Two new packages under `packages/bash/`:
 
 - **`@deepseek-ai/dsh-pwsh-local`** — a local implementation of the `ctx.bash` executor seam over `ctx.subprocess`, mirroring `dsh-bash-local` call-for-call: `resolve()` defaults and caps from config, `run()` fuses the config-clamped timeout with the caller's signal through one deadline, `start()` returns a consuming background handle whose processes belong to the subprocess service. The command string rides as ONE argv element to `pwsh -NoLogo -NoProfile -NonInteractive -Command`, so PowerShell parses it and no shell-quoting layer exists. Executable resolution (`resolvePwshPath`) is a pure function of `(configured, env, platform)`: explicit config first, then Windows probes PowerShell 7's install, PATH entries (quotes stripped), and Windows PowerShell 5.1, else a bare `pwsh` via PATH.
-- **`@deepseek-ai/dsh-tool-pwsh`** — the model-facing tool over `ctx.bash`, PowerShell-dialect by contract, mirroring `dsh-tool-bash` call-for-call minus the sandbox surface: foreground and `run_in_background` execution through the generic task runtime, managed `DSH_*` environment through the shared [`dsh-bash-env`](../feature/2026-08-02-pwsh-tool-bash-parity.md) registry, and the bash marker/truncation rendering story (a clean exit produces no marker). The parity decision supersedes this note's minimal-profile tool description.
+- **`@deepseek-ai/dsh-tool-pwsh`** — the model-facing tool over `ctx.bash`, PowerShell-dialect by contract, mirroring `dsh-tool-bash` call-for-call: foreground and `run_in_background` execution through the generic task runtime, managed `DSH_*` environment through the shared [`dsh-bash-env`](../feature/2026-08-02-pwsh-tool-bash-parity.md) registry, the bash marker/truncation rendering story (a clean exit produces no marker), and — since the Windows ACL sandbox decision — the sandbox denial rendering and `sandbox_permissions` escalation surface, plus a Windows-specific ConstrainedLanguage contract in the tool description. The parity decision supersedes this note's minimal-profile tool description.
 
 Windows vitest coverage is deliberately NOT part of this change: the repo's Windows CI lane owns build/static gates, and unit coverage runs on Linux, where both packages' suites run against a real `pwsh` (preinstalled on the GitHub-hosted runners) or self-skip when absent. The vitest `windowsUnsupportedPackages` exclusion narrows from `packages/bash/*` to the bash-requiring packages so the pwsh suites can also run natively on Windows dev machines.
 
@@ -23,13 +23,13 @@ The roadmap beyond this decision — defaulting Windows hosts to `pwsh` (bash of
 
 **Extend `dsh-bash-local` with a pwsh mode.** Rejected: the executor's identity is the shell it spawns; a second dialect inside one package doubles its config surface (`shell` switches) and its test matrix, and the two dialects' quirks (signal facts on Windows, quoting domains) belong to their own packages' documentation.
 
-**Extend `dsh-tool-bash` with a dialect parameter.** Rejected: the bash tool's background/sandbox surface is bash-shaped; a `pwsh` mode would either hide it (conditional schema churn) or inherit it (surface the minimal profile explicitly rejects). The minimal twin keeps the model contract honest.
+**Extend `dsh-tool-bash` with a dialect parameter.** Rejected: the model-visible contract is the dialect itself (paths, variables, exit facts differ), so a dialect parameter would either churn the schema conditionally or force one tool to teach two dialects; the separate twin keeps the model contract honest — and carries the shared surfaces (background, sandbox, rendering) by mirroring rather than by sharing an implementation.
 
 **Wire the pwsh tool into the shipped CLI compositions now.** Rejected: mounting `tool-pwsh` + `pwsh-local` in `base.cordis.yml` would change the shipped roster before the Windows-default decision lands; this change ships the capability and its wiring points (`apps/cli` dependencies, tsconfig projects) without switching any default.
 
 ## Consequences
 
 - The bash executor seam gains a second, Windows-native implementation with an identical request/spec contract, so model-facing consumers beyond `tool-pwsh` (hooks bridges, in-process plugins) can run PowerShell without dialect shims.
-- `tool-pwsh` is the model-visible Windows-first shell tool: behaviorally interchangeable with the bash tool for foreground and background work (minus sandbox), with prompt guidance that states the marker contract precisely.
+- `tool-pwsh` is the model-visible Windows-first shell tool: behaviorally interchangeable with the bash tool for foreground, background, and sandboxed work — including the same-turn `sandbox_permissions` escalation through `ctx.approval` — with prompt guidance that states the marker contract, the sandbox denial/escalation vocabulary, and the ConstrainedLanguage boundary precisely.
 - Windows semantics differ where the platform differs: forced termination reports exit 1 with no signal (so `signal`/`killed` status facts are POSIX-only), and PowerShell writes CRLF, which tests normalize.
 - The CLI gains two workspace dependencies and two tsconfig projects without mounting either plugin — the composition decision stays with the Windows-default proposal.