refactor(agent-service): redesign sync-execution result and error model

[bobbai00]

What changes were proposed in this PR?

Restructures the per-operator summary the sync-execution backend returns and the agent-service / frontend consume, for a leaner, consistent wire contract. This is a focused re-do of #5927 cut directly from main (no foundation stack): it changes only the execution result/error model and its consumers.

• Replace the flat OperatorInfo with OperatorExecutionSummary (orthogonal sub-summaries: state, errorMessages, resultSummary?, consoleLogsSummary?); rename SyncExecutionResult → WorkflowExecutionSummary.
• resultSummary.sampleTuples is now SampleRow[] ({ rowIndex, tuple }) instead of JSON rows with an embedded __row_index__; drop the table-shape types (the agent derives input-port shapes from the DAG).
• Move WorkflowFatalError into types/execution.ts and reuse it for per-operator errors — the same type the workflow-compiling service returns for compilation errors, so compile and execution errors share one wire shape; api/compile-api.ts re-exports it so its existing importers are unchanged.
• errorMessages / errors are non-optional (empty = none); drop compilationErrors; collapse the console-message types and derive warnings from WARNING:-titled messages.
• Operator results are still pulled on demand via GET /agents/:id/operator-results (transport unchanged); that REST payload now carries the canonical OperatorExecutionSummary, and the frontend maps it to its flat display type (re-flattening sampleTuples so the display components are unchanged).

Touches the Scala producer (SyncExecutionResource), the agent-service consumers (result-formatting, workflow-execution-tools, workflow-result-state, server), and the frontend mapping. Representation/type-level; behavior preserved (input-port shape lines are now derived rather than explicitly rendered).

Any related issues, documentation, discussions?

Closes #5750
Part of #5747.
Supersedes #5927.

How was this PR tested?

• agent-service: tsc --noEmit clean, bun test 110/110 pass, prettier --check clean.
• The Scala producer (SyncExecutionResource) is unchanged from refactor(agent-service): redesign sync-execution result and error model #5927, which verified it via sbt WorkflowExecutionService/compile and a full-stack end-to-end run (a Claude Haiku 4.5 agent built and executed a CSV workflow; /operator-results returned the new shape — resultSummary.sampleTuples: [{ rowIndex, tuple }], errorMessages: []).

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Opus 4.8 (1M context)

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @Ma77Ball, @Yicong-Huang
  You can notify them by mentioning @Ma77Ball, @Yicong-Huang in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.16185% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.90%. Comparing base (16a3ddf) to head (43166b9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...ervice/src/agent/tools/workflow-execution-tools.ts	8.88%	41 Missing ⚠️
...t/agent-interaction/agent-interaction.component.ts	14.28%	10 Missing and 2 partials ⚠️
...agent-interaction/agent-interaction.component.html	0.00%	4 Missing and 2 partials ⚠️
agent-service/src/agent/texera-agent.ts	0.00%	1 Missing ⚠️
agent-service/src/agent/workflow-result-state.ts	50.00%	1 Missing ⚠️
...result-table-frame/result-table-frame.component.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6009      +/-   ##
============================================
+ Coverage     56.64%   56.90%   +0.26%     
  Complexity     3028     3028              
============================================
  Files          1124     1125       +1     
  Lines         43298    43126     -172     
  Branches       4667     4647      -20     
============================================
+ Hits          24525    24540      +15     
+ Misses        17335    17145     -190     
- Partials       1438     1441       +3     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from 84022c9
agent-service	45.06% <63.55%> (+0.46%)	⬆️
amber	58.96% <ø> (+0.34%)	⬆️	Carriedforward from 84022c9
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 84022c9
config-service	52.30% <ø> (ø)		Carriedforward from 84022c9
file-service	62.81% <ø> (ø)		Carriedforward from 84022c9
frontend	49.58% <65.45%> (+0.19%)	⬆️
notebook-migration-service	78.57% <ø> (ø)		Carriedforward from 84022c9
pyamber	90.20% <ø> (ø)		Carriedforward from 84022c9
python	90.76% <ø> (ø)		Carriedforward from 84022c9
workflow-compiling-service	55.14% <ø> (ø)		Carriedforward from 84022c9

*This pull request uses carry forward flags. Click here to find out more.

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[github-actions]

⚠️ Benchmark changes need a look

🟢 2 better · 🔴 4 worse · ⚪ 9 noise (<±5%) · 0 without baseline

Compared against main 16a3ddf benchmarked on this same runner, so the delta is largely free of cross-runner hardware noise. The "7d avg" column still reflects the gh-pages dashboard. Treat <±5% as noise unless repeated.

Dashboard · Run

	config	throughput	MB/s	latency	max Δ latest / 7d
🔴	bs=10 sw=10 sl=64	415	0.253	23,026/31,343/31,343 us	🟢 -14.0% / 🔴 +104.4%
🔴	bs=100 sw=10 sl=64	927	0.566	109,426/127,858/127,858 us	🔴 +5.2% / 🔴 +15.6%
⚪	bs=1000 sw=10 sl=64	1,088	0.664	917,919/981,651/981,651 us	⚪ within ±5% / 🟢 +11.1%

Baseline details

Latest main 16a3ddf from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	415 tuples/sec	445 tuples/sec	757.16 tuples/sec	-6.7%	-45.2%
bs=10 sw=10 sl=64	MB/s	0.253 MB/s	0.271 MB/s	0.462 MB/s	-6.6%	-45.3%
bs=10 sw=10 sl=64	p50	23,026 us	20,250 us	12,971 us	+13.7%	+77.5%
bs=10 sw=10 sl=64	p95	31,343 us	36,438 us	15,333 us	-14.0%	+104.4%
bs=10 sw=10 sl=64	p99	31,343 us	36,438 us	18,732 us	-14.0%	+67.3%
bs=100 sw=10 sl=64	throughput	927 tuples/sec	971 tuples/sec	957.66 tuples/sec	-4.5%	-3.2%
bs=100 sw=10 sl=64	MB/s	0.566 MB/s	0.593 MB/s	0.585 MB/s	-4.6%	-3.2%
bs=100 sw=10 sl=64	p50	109,426 us	104,025 us	103,982 us	+5.2%	+5.2%
bs=100 sw=10 sl=64	p95	127,858 us	122,334 us	110,583 us	+4.5%	+15.6%
bs=100 sw=10 sl=64	p99	127,858 us	122,334 us	118,369 us	+4.5%	+8.0%
bs=1000 sw=10 sl=64	throughput	1,088 tuples/sec	1,114 tuples/sec	979.6 tuples/sec	-2.3%	+11.1%
bs=1000 sw=10 sl=64	MB/s	0.664 MB/s	0.68 MB/s	0.598 MB/s	-2.4%	+11.1%
bs=1000 sw=10 sl=64	p50	917,919 us	895,581 us	1,024,553 us	+2.5%	-10.4%
bs=1000 sw=10 sl=64	p95	981,651 us	956,229 us	1,063,789 us	+2.7%	-7.7%
bs=1000 sw=10 sl=64	p99	981,651 us	956,229 us	1,096,239 us	+2.7%	-10.5%

Raw CSV

config_idx,batch_size,schema_width,string_len,num_batches,total_ms,total_tuples,total_bytes,tuples_per_sec,mb_per_sec,lat_p50_us,lat_p95_us,lat_p99_us
0,10,10,64,20,482.01,200,128000,415,0.253,23026.11,31342.52,31342.52
1,100,10,64,20,2157.69,2000,1280000,927,0.566,109426.49,127857.60,127857.60
2,1000,10,64,20,18389.10,20000,12800000,1088,0.664,917918.64,981651.47,981651.47