feat(tools): require cancellation signal on every invocation

examples/acp-agent/tests/snapshots/cancel-tool-calls/session.jsonl

@@ -15,6 +15,6 @@
 {"type":"tool/call","seq":13,"time":1784437195078,"data":{"turn":1,"step":1,"callId":"call_wait","name":"bash","arguments":"{\"command\":\"node -e \\\"setInterval(() => {}, 1000)\\\"\",\"description\":\"Wait until cancellation\"}"}}
 {"type":"tool/result","seq":14,"time":1784437195089,"data":{"turn":1,"step":1,"callId":"call_wait","content":[{"type":"text","text":"Error: command aborted"}],"isError":true},"sourceEventSeqs":[13],"surfaceOp":"append"}
 {"type":"tool/call","seq":15,"time":1784437195089,"data":{"turn":1,"step":1,"callId":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}
-{"type":"tool/result","seq":16,"time":1784437195089,"data":{"turn":1,"step":1,"callId":"call_skipped","content":[{"type":"text","text":"Error: tool call skipped because the step was aborted before execution"}],"isError":true,"error":{"name":"AbortError","code":"ABORTED"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
+{"type":"tool/result","seq":16,"time":1784437195089,"data":{"turn":1,"step":1,"callId":"call_skipped","content":[{"type":"text","text":"Error: tool call aborted before dispatch"}],"isError":true,"error":{"name":"AbortError","code":"ABORTED_BEFORE_DISPATCH"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
 {"type":"step/end","seq":17,"time":1784437195090,"data":{"turn":1,"step":1}}
 {"type":"turn/end","seq":18,"time":1784437195090,"data":{"turn":1,"reason":{"kind":"aborted","reason":"session/cancel"}}}

examples/acp-agent/tests/snapshots/cancel-tool-calls/stdout.expected.jsonl

@@ -4,4 +4,4 @@
 {"jsonrpc":"2.0","id":3,"result":{"stopReason":"cancelled"}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_wait","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\nError: command aborted\n```"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_skipped","title":"printf skipped > skipped.txt","kind":"execute","status":"in_progress","rawInput":"printf skipped > skipped.txt","content":[{"type":"content","content":{"type":"text","text":"Write skipped marker"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_skipped","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\nError: tool call skipped because the step was aborted before execution\n```"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_skipped","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\nError: tool call aborted before dispatch\n```"}}]}}}

examples/cordis-agent/tests/cordis-tools.e2e.ts

@@ -4,6 +4,8 @@ import { CallId } from '@deepseek-ai/dsh-llm'
 import { cordisHarness, waitForIdle } from './harness.ts'
 import { SessionId } from '@deepseek-ai/dsh-session'
 
+const testToolSignal = new AbortController().signal
+
 /**
  * With-key smoke for the self-referential cordis tools: a REAL model drives
  * cordis_mount/cordis_unmount against the live context the test observes.
@@ -51,6 +53,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('cordis tools: a real model modif
     // the mounted listener through the tagged sandbox console.
     expect(taggedCalls(log).length).toBeGreaterThan(0)
     const mid = await ctx.tools.execute({
+      signal: testToolSignal,
       callId: CallId('verify-mounted'), name: 'cordis_inspect', arguments: { what: 'dynamic' },
     })
     expect(resultText(mid)).toContain('dyn-')
@@ -59,6 +62,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('cordis tools: a real model modif
     await waitForIdle(ctx, agent)
 
     const after = await ctx.tools.execute({
+      signal: testToolSignal,
       callId: CallId('verify-unmounted'), name: 'cordis_inspect', arguments: { what: 'dynamic' },
     })
     expect(resultText(after)).toContain('(no dynamic plugins mounted)')
@@ -148,6 +152,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('cordis tools: a real model modif
     expect(ctx.get('shouter')).toBeUndefined()
     expect(ctx.tools.get('shout_text')).toBeUndefined()
     const after = await ctx.tools.execute({
+      signal: testToolSignal,
       callId: CallId('verify-parked'), name: 'cordis_inspect', arguments: { what: 'dynamic' },
     })
     expect(resultText(after)).toContain('waiting for: shouter')