fix(bash): preserve configured shell behavior

docs/workflow/bash-worktree-cwd-record.md

@@ -3,8 +3,8 @@
 ## Status
 
 - Status: active
-- Current phase: 7. Independent review
-- Next safe action: obtain standards and specification review of the pinned product diff.
+- Current phase: 6. Verify remediated worktree
+- Next safe action: commit the accepted review remediations and rerun the full repository test suite.
 
 ## Request and scope
 
@@ -46,6 +46,7 @@
 | Workflow setup and research | parent Pi session `01a06e08-8d07-76a7-a116-d7e3baf55b87` | 15 minutes | workflow record only | Before: clean `main` at `7e7cfdb`; after: clean feature worktree at `5f853dc` | Complete |
 | Initial dependency-plan implementation | parent Pi session `01a06e08-8d07-76a7-a116-d7e3baf55b87` | 15 minutes | `package.json`, `bun.lock`, focused test, workflow record | Before: clean feature worktree at `9d68d5f`; after: Pi 0.85.0 upgrade restored; focused red test retained unstaged | Paused and replanned after upstream packaging blocker |
 | Local override implementation | parent Pi session `01a06e08-8d07-76a7-a116-d7e3baf55b87` | 15 minutes | `extensions/bash-cwd/**`, `scripts/bash-cwd.test.mjs` removal, `package.json`, `scripts/package-workspaces.test.mjs`, `README.md`, `docs/npm-packages.md`, `docs/todos.md`, `docs/workflow/skill-led-development-workflow-plan.md`, workflow record | Before: feature worktree at `3d68f7c` with inspected product changes; after: clean product commit `328faa0` | Complete |
+| Review remediation cycle 1 | parent Pi session `01a06e08-8d07-76a7-a116-d7e3baf55b87` | 15 minutes | `extensions/bash-cwd/index.ts`, `extensions/bash-cwd/index.test.ts`, `extensions/bash-cwd/README.md`, workflow record | Before: clean review pin `3cf354b`; after: focused tests and typecheck pass, remediation commit pending | In progress |
 
 ## Verification matrix
 
@@ -53,7 +54,7 @@
 | --- | --- | --- | --- |
 | Source/cache preflight | `git status --short --branch`; `opensrc path ...` | 0 | Clean source; Pi 0.84.4 and 0.85.0 source available locally. |
 | Focused cwd reproduction | inline Node harness against Pi 0.84.4 | 0 (asserted buggy outcome) | Both hidden-worktree requests observed the primary checkout; a missing requested cwd still executed a sentinel command. |
-| Focused cwd regression | `bun run --filter '@jbcode/pi-bash-cwd' test` | 0 | Three tests pass: explicit absolute hidden-worktree cwd, relative nested-package cwd, omitted cwd/session environment, schema compatibility, missing cwd sentinel, and missing context. |
+| Focused cwd regression | `bun run --filter '@jbcode/pi-bash-cwd' test` | 0 | Four tests pass: explicit absolute hidden-worktree cwd, relative nested-package cwd, omitted cwd/session environment, configured shell path and command prefix, schema compatibility, missing cwd sentinel, and missing context. |
 | Package contract | `bun run test:packages`; `bun pm pack --destination /tmp --ignore-scripts --quiet` | 0 | Workspace inventory and package contents pass; package tarball created. |
 | Typecheck | `bun run typecheck` | 0 | Repository TypeScript check passes. |
 | Full tests | `bun run test` | 0 | The complete repository test chain passed in background task `bg_jdbm_mtnfe0ie_1`; Node reported 305/305 in the consolidated suite and Vitest reported 22/22 file-search tests. |
@@ -67,10 +68,10 @@
 - Exact diff command: `git diff --binary --full-index --find-renames 7e7cfdb5cb0e1a1218b9a2c8250267d5099637fc...328faa03e014bb7d29296d520297d05f0981fb33 --`
 - SHA-256: `b3b1ee7bfc70655a1324f6da943e2192987693d62495912cc866151b58d1c1a7`
 - Mutator identities: parent Pi session `01a06e08-8d07-76a7-a116-d7e3baf55b87`
-- Standards reviewer identity, digest confirmation, and verdict: pending
-- Specification reviewer identity, digest confirmation, and verdict: pending
-- Findings and remediation cycles: Pi 0.85.0 includes a separate upstream `ctx.cwd` correction but its public package imports undeclared `@earendil-works/pi-server`, causing `ERR_MODULE_NOT_FOUND`; the user selected a repository-owned override instead. During implementation, a direct live call with an extra `cwd` field still printed the primary checkout, proving Pi's schema/executor silently ignore the requested per-call directory and the first local design addressed the wrong seam. Current uncommitted package/test/docs changes were inspected; further mutation is paused for the corrected explicit-argument plan.
-- Before/after reviewer Git evidence: pending
+- Standards reviewer identity, digest confirmation, and verdict: `bash-cwd-standards`, scout child session `01a06e2f-665e-7acc-a2cd-98f976a13b43`; digest confirmed; FAIL on first review.
+- Specification reviewer identity, digest confirmation, and verdict: `bash-cwd-specification`, scout child session `01a06e2f-b262-77f1-9aef-d5c964cb33b6`, subagent `8ae886b2`; digest confirmed; FAIL on first review.
+- Findings and remediation cycles: Pi 0.85.0 includes a separate upstream `ctx.cwd` correction but its public package imports undeclared `@earendil-works/pi-server`, causing `ERR_MODULE_NOT_FOUND`; the user selected a repository-owned override instead. During implementation, a direct live call with an extra `cwd` field still printed the primary checkout, proving Pi's schema/executor silently ignore the requested per-call directory and the first local design addressed the wrong seam. Review cycle 1 accepted three findings: preserve configured `shellPath` and `shellCommandPrefix` when recreating Pi's built-in definition; make retirement contingent on equivalent validated per-call cwd; and label npm installation as post-publication. The parent implementer loaded trusted Pi settings at execution, added a realistic custom-shell/prefix regression, and corrected package guidance.
+- Before/after reviewer Git evidence: both reviewers reported clean `feature/honor-bash-worktree-cwd` state, product HEAD `328faa0`, product tree `6b858045b91298c91f55aedd848c3a02432edafb`, and the complete changed-path set before and after their read-only reviews; current review-pin HEAD remained `3cf354b`.
 
 ## Integration and rollback
 
@@ -83,5 +84,5 @@
 ## Checkpoints and blockers
 
 - Last committed valid checkpoint: product commit `328faa0`
-- Blockers: standards and specification review verdicts are pending.
-- Exact next safe action: commit this review pin, then launch two independent read-only reviewers against the recorded digest.
+- Blockers: full post-remediation verification and fresh reviews are pending.
+- Exact next safe action: commit remediation cycle 1, rerun `bun run test`, and pin a fresh product digest.

extensions/bash-cwd/README.md

@@ -4,15 +4,15 @@ Pi extension that adds an optional `cwd` argument to the built-in `bash` tool. A
 
 The override delegates execution and rendering to Pi's built-in Bash implementation. Existing `command` and `timeout` calls remain compatible.
 
-## Install
+## Try from this checkout
 
 ```bash
-pi install npm:@jbcode/pi-bash-cwd
+pi -e ./extensions/bash-cwd/index.ts
 ```
 
-Restart Pi or run `/reload` after installation. Pi warns that the extension replaces the built-in `bash` tool; that warning is expected.
+Pi warns that the extension replaces the built-in `bash` tool; that warning is expected. The package is not published yet. After publication, install it with `pi install npm:@jbcode/pi-bash-cwd` and restart Pi or run `/reload`.
 
-Use this package with Pi 0.84.x. Remove it after moving to a Pi release that honors `ctx.cwd` and can be imported by extensions without undeclared runtime dependencies.
+Use this package with Pi 0.84.x. Remove it only after moving to a Pi release that exposes equivalent validated per-call `cwd` behavior and can be imported by extensions without undeclared runtime dependencies.
 
 ## Verify
 

extensions/bash-cwd/index.test.ts

@@ -1,6 +1,13 @@
 import assert from "node:assert/strict";
 import { execFileSync } from "node:child_process";
-import { access, mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
+import {
+  access,
+  chmod,
+  mkdir,
+  mkdtemp,
+  rm,
+  writeFile,
+} from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import test from "node:test";
@@ -29,7 +36,7 @@ async function executeIn(
   cwd?: string,
 ) {
   const params = cwd === undefined ? { command } : { command, cwd };
-  return createContextualBashTool().execute(
+  return createContextualBashTool({}).execute(
     "bash-cwd-test",
     params,
     undefined,
@@ -91,14 +98,55 @@ test("bash honors hidden-worktree and nested-package cwd arguments", async (t) =
   await assert.rejects(access(sentinel));
 });
 
+test("bash preserves configured command prefixes and shell paths", async (t) => {
+  const directory = await mkdtemp(join(tmpdir(), "pi-bash-cwd-options-"));
+  t.after(() => rm(directory, { recursive: true, force: true }));
+
+  const shellMarker = join(directory, "custom-shell-used");
+  const shell = join(directory, "custom-shell");
+  await writeFile(
+    shell,
+    `#!/bin/sh\nprintf used > "${shellMarker}"\nexec /bin/bash "$@"\n`,
+  );
+  await chmod(shell, 0o755);
+
+  await mkdir(join(directory, ".pi"));
+  await writeFile(
+    join(directory, ".pi", "settings.json"),
+    JSON.stringify({
+      shellCommandPrefix: "printf prefix-",
+      shellPath: shell,
+    }),
+  );
+
+  const tool = createContextualBashTool();
+  const result = await tool.execute(
+    "bash-cwd-options-test",
+    { command: "printf command", cwd: directory },
+    undefined,
+    undefined,
+    {
+      cwd: directory,
+      sessionManager: {
+        getSessionId: () => "bash-cwd-test-session",
+        getSessionFile: () => undefined,
+      },
+      isProjectTrusted: () => true,
+    } as ExtensionContext,
+  );
+
+  assert.equal(getOutput(result), "prefix-command");
+  await access(shellMarker);
+});
+
 test("bash exposes cwd without changing existing arguments", () => {
-  const schema = createContextualBashTool().parameters;
+  const schema = createContextualBashTool({}).parameters;
   assert.deepEqual(Object.keys(schema.properties), ["command", "cwd", "timeout"]);
   assert.deepEqual(schema.required, ["command"]);
 });
 
 test("bash fails before execution when Pi omits the tool context", async () => {
-  const tool = createContextualBashTool();
+  const tool = createContextualBashTool({});
   await assert.rejects(
     tool.execute(
       "bash-cwd-test",

extensions/bash-cwd/index.ts

@@ -3,6 +3,9 @@ import { resolve } from "node:path";
 
 import {
   createBashToolDefinition,
+  getAgentDir,
+  SettingsManager,
+  type BashToolOptions,
   type ExtensionAPI,
   type ExtensionContext,
 } from "@earendil-works/pi-coding-agent";
@@ -52,8 +55,18 @@ async function resolveWorkingDirectory(
   return cwd;
 }
 
-export function createContextualBashTool() {
-  const baseTool = createBashToolDefinition(process.cwd());
+function loadBashOptions(ctx: ExtensionContext): BashToolOptions {
+  const settings = SettingsManager.create(ctx.cwd, getAgentDir(), {
+    projectTrusted: ctx.isProjectTrusted(),
+  });
+  return {
+    commandPrefix: settings.getShellCommandPrefix(),
+    shellPath: settings.getShellPath(),
+  };
+}
+
+export function createContextualBashTool(options?: BashToolOptions) {
+  const baseTool = createBashToolDefinition(process.cwd(), options);
 
   return {
     ...baseTool,
@@ -72,7 +85,10 @@ export function createContextualBashTool() {
       }
 
       const cwd = await resolveWorkingDirectory(ctx.cwd, params.cwd);
-      const contextualTool = createBashToolDefinition(cwd);
+      const contextualTool = createBashToolDefinition(
+        cwd,
+        options ?? loadBashOptions(ctx),
+      );
       return contextualTool.execute(
         toolCallId,
         { command: params.command, timeout: params.timeout },