fix(tui): surface verbose tool details (#30225)

* fix(tui): surface verbose tool details

Emit redacted structured verbose args/results to the TUI so /verbose verbose can show full tool detail without reopening stdout, and fail closed if redaction is unavailable.

Salvages #29011.

Co-authored-by: helix4u <4317663+helix4u@users.noreply.github.com>

* fix(tui): address verbose detail review

Label verbose tool failures as errors, cover forced verbose reasoning, and avoid new diff type warnings from the redaction regression tests.

* fix(tui): bound verbose tool payloads

Cap verbose tool detail text before emitting JSON-RPC events and preserve verbose results on inline diff completions.

* fix(tui): align termux argv test with gc flag

Update the stale TUI launch expectation so the Termux freshness path matches the current direct Node argv.

---------

Co-authored-by: helix4u <4317663+helix4u@users.noreply.github.com>

ui-tui/src/__tests__/createGatewayEventHandler.test.ts

@@ -342,6 +342,25 @@ describe('createGatewayEventHandler', () => {
     expect(appended[appended.length - 1]).toMatchObject({ role: 'assistant', text: 'final answer' })
   })
 
+  it('shows verbose reasoning even when normal reasoning display is off', () => {
+    vi.useFakeTimers()
+    patchUiState({ showReasoning: false })
+    const appended: Msg[] = []
+    const streamed = 'verbose-only reasoning'
+
+    try {
+      const onEvent = createGatewayEventHandler(buildCtx(appended))
+
+      onEvent({ payload: { text: streamed, verbose: true }, type: 'reasoning.delta' } as any)
+      vi.runOnlyPendingTimers()
+
+      expect(turnController.reasoningText).toBe(streamed)
+      expect(getTurnState().reasoning).toBe(streamed)
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
   it('ignores fallback reasoning.available when streamed reasoning already exists', () => {
     const appended: Msg[] = []
     const streamed = 'short streamed reasoning'
@@ -485,6 +504,25 @@ describe('createGatewayEventHandler', () => {
     expect(appended[3]?.text).not.toContain('```diff')
   })
 
+  it('keeps verbose result text on inline_diff tool completions', () => {
+    const appended: Msg[] = []
+    const onEvent = createGatewayEventHandler(buildCtx(appended))
+    const diff = '--- a/foo.ts\n+++ b/foo.ts\n@@\n-old\n+new'
+
+    onEvent({
+      payload: { args_text: '{ "path": "foo.ts" }', context: 'foo.ts', name: 'patch', tool_id: 'tool-1' },
+      type: 'tool.start'
+    } as any)
+    onEvent({
+      payload: { inline_diff: diff, result_text: 'patched result', tool_id: 'tool-1' },
+      type: 'tool.complete'
+    } as any)
+
+    expect(turnController.segmentMessages[0]).toMatchObject({ kind: 'diff' })
+    expect(turnController.segmentMessages[0]?.tools?.[0]).toContain('Args:\n{ "path": "foo.ts" }')
+    expect(turnController.segmentMessages[0]?.tools?.[0]).toContain('Result:\npatched result')
+  })
+
   it('keeps full final responses from duplicating flushed pre-diff narration', () => {
     const appended: Msg[] = []
     const onEvent = createGatewayEventHandler(buildCtx(appended))