fix: improve performance of orderSequenceByDependencies

[ysmolski]

There are multiple improvements that I have applied to this post processor.
This happened on plans created for mutations with more than 30 fetches.
Such plans have densely populated dependencies
(each next fetch in a sequence depends on all fetches before).

In the end that post-processor was completely rewritten.
Things were done roughly in this order:

• I have pre-computed the calculation of all dependencies per fetch.
• Topological comparisons were simplified because the size of
  dependencies gives the good ordering, that is only followed by the fetch IDs.
• In the pre-compute instead of using maps I drafted a simple implementation
  of bitset since fetch IDs are densely populated.

Summary by CodeRabbit

• Chores

  • Updated GraphQL tooling used by the router and router test components to a newer stable release, improving consistency across related components.

• Documentation

  • Corrected test documentation describing cases where deferred GraphQL results may be discarded because matching non-deferred fields are already present.

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ℹ️ Recent review info

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Run ID: 51acda45-7bd6-471b-8832-c2adc22358f2

📥 Commits

Reviewing files that changed from the base of the PR and between 7e252b3 and 4404f10.

⛔ Files ignored due to path filters (2)

• router-tests/go.sum is excluded by !**/*.sum
• router/go.sum is excluded by !**/*.sum

📒 Files selected for processing (2)

• router-tests/go.mod
• router/go.mod

🚧 Files skipped from review as they are similar to previous changes (1)

• router-tests/go.mod

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Walkthrough

The PR updates the GraphQL tools dependency in both router modules to v2.20.1 and corrects a comment describing @defer behavior.

Changes

Router dependency and defer test maintenance

Layer / File(s)	Summary
GraphQL tools dependency update router/go.mod, router-tests/go.mod	Both modules update github.com/wundergraph/graphql-go-tools/v2 to release v2.20.1.
Defer test comment correction router-tests/protocol/defer_test.go	The comment describing when @defer can be discarded is corrected.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 4404f

This updates the GraphQL tools release used by the router modules and corrects @defer test guidance. No current merge-blocking behavior or integrity risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (2 skipped: 2 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main performance improvement to orderSequenceByDependencies. It does not include an issue identifier. At 55 characters, it exceeds the preferred 50-character length.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (2 skipped: 2 unsupported.)

• Fix all pre-merge checks with AI

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[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-c1d3153884677556f3f87277c361a08807852bbf

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.99%. Comparing base (cfcefd3) to head (4404f10).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3216      +/-   ##
==========================================
- Coverage   66.99%   62.99%   -4.00%     
==========================================
  Files         778      266     -512     
  Lines       63328    31575   -31753     
  Branches     7847        0    -7847     
==========================================
- Hits        42425    19890   -22535     
+ Misses      18193    10144    -8049     
+ Partials     2710     1541    -1169     

see 515 files with indirect coverage changes

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