docs(mobile): record Source Control on the generic host lane

Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb

docs/reference/mobile-hybrid-webview-architecture.md

@@ -209,8 +209,14 @@ edges still meet the device and keep their measured values.
   its host-work slot until the host call settles. The Desktop is trusted, so the
   page addresses host tabs, browser pages and provider sessions by their host
   ids. Generic subscriptions, native-chat domain actions, file reads, Source
-  Control reads/watch, session snapshot/feed/actions and terminal metadata use
-  this path.
+  Control (status, diff, history, branches, compares, review metadata and the
+  Git writes), session snapshot/feed/actions and terminal metadata use this
+  path. A Source Control result the Desktop cannot bound in its own shape is
+  projected and clipped by a `mobileWeb.sourceControl.*` wrapper before it
+  crosses the bridge; the writes the page reaches are the Git methods
+  themselves. Only commit-message generation still runs as a shell operation,
+  because it outlives the host lane's fifteen-second request deadline and the
+  page cancels it while it runs.
 - Decisions behind the generic lane and its 2026-09-07 simplification are in
   [`plans/2026-09-07-long-lived-mobile-shell-decisions.md`](./plans/2026-09-07-long-lived-mobile-shell-decisions.md).
   Unmigrated domain operations keep their current adapters until moved.

mobile/src/mobile-web/mobile-web-capability-execution-arms.ts

@@ -113,15 +113,15 @@ async function executeSourceControl(args: Deps, request: OnceRequest): Promise<u
       args.workspaceAuthority
     )
   }
-  if (request.operation !== 'generateCommitMessage') {
-    throw new MobileWebBrokerError('unsupported_capability')
+  if (request.operation === 'generateCommitMessage') {
+    return args.commitMessageGeneration.generate({
+      requestId: request.requestId,
+      payload: request.payload,
+      client: args.connectedClient(),
+      workspaceAuthority: args.workspaceAuthority
+    })
   }
-  return args.commitMessageGeneration.generate({
-    requestId: request.requestId,
-    payload: request.payload,
-    client: args.connectedClient(),
-    workspaceAuthority: args.workspaceAuthority
-  })
+  throw new MobileWebBrokerError('unsupported_capability')
 }
 
 async function executeSpeech(args: Deps, request: OnceRequest): Promise<unknown> {

src/mobile-web/src/mobile-web-bridge-client.ts

@@ -47,7 +47,7 @@ import { mobileWebReviewClientBindings } from './mobile-web-review-client-bindin
 import { mobileWebSessionClientBindings } from './mobile-web-session-client-bindings'
 import { MobileWebSessionRequestClient } from './mobile-web-session-request-client'
 import { mobileWebSourceControlClientBindings } from './mobile-web-source-control-client-bindings'
-import { MobileWebCommitMessageRequestClient } from './mobile-web-source-control-commit-message-client'
+import { MobileWebCommitMessageRequestClient } from './mobile-web-commit-message-request-client'
 import { MobileWebSourceControlRequestClient } from './mobile-web-source-control-request-client'
 import type { MobileWebSourceControlReviewRequestClient } from './mobile-web-source-control-review-request-client'
 import { MobileWebSourceControlSyncRequestClient } from './mobile-web-source-control-sync-request-client'

src/mobile-web/src/mobile-web-source-control-client-bindings.ts

@@ -1,4 +1,4 @@
-import type { MobileWebCommitMessageRequestClient } from './mobile-web-source-control-commit-message-client'
+import type { MobileWebCommitMessageRequestClient } from './mobile-web-commit-message-request-client'
 import type { MobileWebSourceControlRequestClient } from './mobile-web-source-control-request-client'
 import type { MobileWebSourceControlSyncRequestClient } from './mobile-web-source-control-sync-request-client'
 

src/shared/mobile-web/bridge-contract.test.ts

@@ -169,7 +169,7 @@ describe('mobile web bridge page contract', () => {
     ).toBe(false)
   })
 
-  it.each(['branches', 'history', 'branchCompare', 'commitCompare'])(
+  it.each(['generateCommitMessage', 'cancelCommitMessageGeneration'])(
     'accepts the explicit source-control %s operation',
     (operation) => {
       expect(

src/shared/mobile-web/bridge-operation-echo-census.test.ts

@@ -41,28 +41,8 @@ const EXPECTED_ECHO_FIELDS: Record<string, readonly string[]> = {
     'submittedCommentIds',
     'workspaceId'
   ],
-  'sourceControl.abort': ['operation', 'previousBranch', 'previousHead', 'workspaceId'],
-  'sourceControl.branch': ['branch', 'operation', 'previousBranch', 'previousHead', 'workspaceId'],
-  'sourceControl.branchCompare': ['baseRef', 'offset', 'revision', 'workspaceId'],
-  'sourceControl.branches': ['workspaceId'],
   'sourceControl.cancelCommitMessageGeneration': ['workspaceId'],
-  'sourceControl.commit': ['previousHead', 'workspaceId'],
-  'sourceControl.commitCompare': ['commitId', 'workspaceId'],
-  'sourceControl.discard': ['operation', 'relativePaths.length', 'workspaceId'],
-  'sourceControl.fetch': ['operation', 'previousBranch', 'previousHead', 'workspaceId'],
   'sourceControl.generateCommitMessage': ['previousHead', 'workspaceId'],
-  'sourceControl.history': ['limit', 'workspaceId'],
-  'sourceControl.pull': ['operation', 'previousBranch', 'previousHead', 'workspaceId'],
-  'sourceControl.push': ['operation', 'previousBranch', 'previousHead', 'workspaceId'],
-  'sourceControl.rebase': ['operation', 'previousBranch', 'previousHead', 'workspaceId'],
-  'sourceControl.reviewDiff': ['relativePath', 'scope', 'workspaceId'],
-  'sourceControl.reviewLink': ['workspaceId'],
-  'sourceControl.reviewLinkUpdate': ['workspaceId'],
-  'sourceControl.reviewMetadata': ['workspaceId'],
-  'sourceControl.reviewMetadataUpdate': ['workspaceId'],
-  'sourceControl.stage': ['operation', 'relativePaths.length', 'workspaceId'],
-  'sourceControl.unstage': ['operation', 'relativePaths.length', 'workspaceId'],
-  'sourceControl.upstream': ['workspaceId'],
   'task.loadLinearDetail': ['issue.targetId'],
   'task.loadLinearIssue': ['issue.targetId'],
   'task.projectTable': ['project', 'selectedView.id'],
@@ -296,7 +276,7 @@ describe('mobile web bridge operation echo census', () => {
     )
 
     expect(Object.keys(EXPECTED_ECHO_FIELDS).filter((key) => !registered.has(key))).toEqual([])
-    expect(Object.keys(EXPECTED_ECHO_FIELDS).length).toBeGreaterThanOrEqual(49)
+    expect(Object.keys(EXPECTED_ECHO_FIELDS).length).toBeGreaterThanOrEqual(29)
   })
 
   it('guards the page workspace handle on every workspace-scoped echo it records', () => {
@@ -304,6 +284,6 @@ describe('mobile web bridge operation echo census', () => {
       fields.some((field) => field === 'workspaceId')
     )
 
-    expect(workspaceScoped.length).toBeGreaterThanOrEqual(40)
+    expect(workspaceScoped.length).toBeGreaterThanOrEqual(20)
   })
 })

src/shared/mobile-web/bridge-operation-registry-census.test.ts

@@ -30,7 +30,7 @@ describe('mobile web bridge operation registry census', () => {
     }
 
     expect(files.length).toBeGreaterThanOrEqual(40)
-    expect(named.size).toBeGreaterThanOrEqual(126)
+    expect(named.size).toBeGreaterThanOrEqual(118)
     expect([...named].filter((pair) => !registered.has(pair))).toEqual([])
   })
 
@@ -61,7 +61,7 @@ describe('mobile web bridge operation registry census', () => {
       }
     }
 
-    expect(pairs.size).toBeGreaterThanOrEqual(126)
+    expect(pairs.size).toBeGreaterThanOrEqual(118)
     expect([...pairs].filter(([, schemas]) => schemas.size !== 1).map(([key]) => key)).toEqual([])
     expect([...pairs.keys()].filter((key) => !registered.has(key))).toEqual([])
     expect(