ci: enable Renovate config migration PRs

[Yicong-Huang]

What changes were proposed in this PR?

Set configMigration: true in .github/renovate.json5, so that when a config option we use is renamed or deprecated upstream, Renovate opens a PR migrating this file instead of silently logging a warning.

The branch is deliberately named renovate/reconfigure: per the Renovate reconfigure docs, the bot validates the edited config and posts the expected changes as a comment on this PR. This also serves as a liveness probe — Renovate has not processed the repo since .github/renovate.json5 landed in #6848 (the onboarding PR #6855 was closed unmerged shortly before that merge, which flagged the repo as disabled on Mend's side).

Any related issues, documentation, discussions?

Follow-up to #6848; related to onboarding PR #6855.

How was this PR tested?

• renovate.json5 change validated against the Renovate config schema.
• Renovate's config validation comment on this PR (once the bot processes it) is the end-to-end check.

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

Generated-by: Claude Code (Fable 5)

[github-actions]

Automated Reviewer Suggestions

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

• No candidates found from git blame history.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.97%. Comparing base (7e4a9b4) to head (1145bbf).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6893      +/-   ##
============================================
- Coverage     77.97%   77.97%   -0.01%     
  Complexity     3661     3661              
============================================
  Files          1161     1161              
  Lines         46059    46059              
  Branches       5105     5105              
============================================
- Hits          35915    35914       -1     
- Misses         8521     8523       +2     
+ Partials       1623     1622       -1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)
agent-service	76.76% <ø> (ø)
amber	70.67% <ø> (ø)		Carriedforward from 7e4a9b4
computing-unit-managing-service	20.49% <ø> (ø)
config-service	66.66% <ø> (ø)
file-service	67.21% <ø> (ø)
frontend	82.64% <ø> (+<0.01%)	⬆️
notebook-migration-service	78.94% <ø> (ø)
pyamber	92.35% <ø> (-0.05%)	⬇️
workflow-compiling-service	55.14% <ø> (ø)

*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 · 🔴 3 worse · ⚪ 10 noise (<±5%) · 0 without baseline

Compared against main 7e4a9b4 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	534	0.326	17,907/25,787/25,787 us	🔴 +8.5% / 🔴 +55.4%
⚪	bs=100 sw=10 sl=64	1,125	0.687	86,641/110,706/110,706 us	⚪ within ±5% / 🟢 -16.4%
⚪	bs=1000 sw=10 sl=64	1,331	0.813	748,515/789,279/789,279 us	⚪ within ±5% / 🟢 +32.7%

Baseline details

Latest main 7e4a9b4 from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	534 tuples/sec	582 tuples/sec	754.55 tuples/sec	-8.2%	-29.2%
bs=10 sw=10 sl=64	MB/s	0.326 MB/s	0.355 MB/s	0.461 MB/s	-8.2%	-29.2%
bs=10 sw=10 sl=64	p50	17,907 us	16,504 us	12,816 us	+8.5%	+39.7%
bs=10 sw=10 sl=64	p95	25,787 us	27,168 us	16,594 us	-5.1%	+55.4%
bs=10 sw=10 sl=64	p99	25,787 us	27,168 us	19,806 us	-5.1%	+30.2%
bs=100 sw=10 sl=64	throughput	1,125 tuples/sec	1,155 tuples/sec	969.38 tuples/sec	-2.6%	+16.1%
bs=100 sw=10 sl=64	MB/s	0.687 MB/s	0.705 MB/s	0.592 MB/s	-2.6%	+16.1%
bs=100 sw=10 sl=64	p50	86,641 us	85,019 us	103,584 us	+1.9%	-16.4%
bs=100 sw=10 sl=64	p95	110,706 us	110,724 us	109,097 us	-0.0%	+1.5%
bs=100 sw=10 sl=64	p99	110,706 us	110,724 us	117,304 us	-0.0%	-5.6%
bs=1000 sw=10 sl=64	throughput	1,331 tuples/sec	1,322 tuples/sec	1,004 tuples/sec	+0.7%	+32.6%
bs=1000 sw=10 sl=64	MB/s	0.813 MB/s	0.807 MB/s	0.613 MB/s	+0.7%	+32.7%
bs=1000 sw=10 sl=64	p50	748,515 us	755,427 us	1,002,357 us	-0.9%	-25.3%
bs=1000 sw=10 sl=64	p95	789,279 us	773,322 us	1,046,463 us	+2.1%	-24.6%
bs=1000 sw=10 sl=64	p99	789,279 us	773,322 us	1,073,661 us	+2.1%	-26.5%

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
0,10,10,64,20,374.29,200,128000,534,0.326,17906.62,25787.44,25787.44
1,100,10,64,20,1777.21,2000,1280000,1125,0.687,86641.08,110705.58,110705.58
2,1000,10,64,20,15021.35,20000,12800000,1331,0.813,748514.97,789279.36,789279.36