refactor(acp): reduce bridge to automation protocol

packages/fs/tool-fs/tests/diff.spec.ts

@@ -2,7 +2,7 @@
  * Unit tests for the result-time contextual-diff computation (`src/diff.ts`):
  * the pure before/after → {@link FileDiff}[] hunk builder and the defensive
  * `meta` narrowing. These pin the exact hunk reconstruction (context lines,
- * multi-hunk replaceAll, pure insertion/deletion, no-op) the ACP bridge renders.
+ * multi-hunk replaceAll, pure insertion/deletion, no-op) that UIs render.
  */
 
 import { describe, expect, it } from 'vitest'

packages/fs/tool-fs/tests/integration.spec.ts

@@ -284,8 +284,8 @@ describe('bare provider (no dsh-fs-policy)', () => {
 })
 
 // Per-session cwd: a relative file_path resolves against the calling session's workspace
-// (`exec.agent.session.header.cwd`), not the backend's config.cwd — so an ACP editor's
-// per-session dir wins, matching dsh-tool-bash.
+// (`exec.agent.session.header.cwd`), not the backend's config.cwd, so the
+// caller-selected session workspace wins, matching dsh-tool-bash.
 describe('per-session cwd', () => {
   let sessionDir: string
   beforeEach(async () => {

packages/fs/tool-fs/tests/tools.spec.ts

@@ -425,8 +425,8 @@ describe('edit tool', () => {
 })
 
 describe('tool-owned presentation (pure presentCall)', () => {
-  // presentCall is a pure display function of args (no I/O); it drives the ACP
-  // card's title/kind and the `locations` an editor follows along to.
+  // presentCall is a pure display function of args (no I/O); it drives the
+  // card's title/kind and the `locations` a UI follows along to.
   const presentCall = async (name: string, args: unknown) => {
     const { ctx } = await setup()
     return ctx.tools.get(name)?.presentCall?.(args)
@@ -478,7 +478,7 @@ describe('tool-owned presentation (pure presentCall)', () => {
 
 describe('result-time contextual diff (meta + presentResult)', () => {
   // An edit records the applied contextual hunk on `tool/result` meta, and the tool's
-  // presentResult narrows it back into a `diff` result card the bridge renders.
+  // presentResult narrows it back into a replayable `diff` result card.
   const withContext = 'a\nb\nc\nOLD\nd\ne\nf\n'
 
   it('edit: execute attaches the applied hunk as meta { diffs }', async () => {
@@ -519,9 +519,8 @@ describe('result-time contextual diff (meta + presentResult)', () => {
   })
 
   it('write CREATE: an empty applied-diff projection still falls back to the whole-file diff card', async () => {
-    // A create has no prior content, yet the completed card must be a `diff` — an
-    // ACP tool_call_update.content REPLACES the call's content, so a non-diff result would
-    // clobber the pending new-file diff.
+    // A create has no prior content, yet the completed replacement view must
+    // remain a diff instead of clobbering the pending new-file diff with text.
     const { ctx } = await setup()
     const session = { header: {} }
     const result = await call(ctx, 'write', { file_path: 'new.txt', content: 'fresh\n' }, { session })