fix: remove unused arguments

[Becheler]

#496

Before submitting

• This PR targets the develop branch.
• I searched for an existing PR or issue covering the same change.
• My contribution is licensed under the Boost Software License 1.0.

Type of change

• Bug fix
• New feature or API addition
• Refactor (no behavior change)
• Documentation
• Build, CI, or tooling
• Other (specify below)

Does this PR introduce a breaking change?

• Yes (describe migration impact below)
• No

What this PR does

Numerous examples and test files int main( have unused arguments.

Motivation

Way too many warnings with -Wextra -Wall

Testing

Checklist

• Existing tests pass (b2 in the test/ directory).
• New behavior is covered by a test, or this is a docs / build / refactor change.
• Documentation was updated if user-facing behavior changed.
• No new compiler warnings on the platforms I built against.

[github-actions]

Boost dependency footprint vs develop (auto-generated).
PR run 31246275249 vs develop run 31207793080 (46ad50e8b2).

Header-inclusion weights (graph files pulling each direct dependency in):

No header-inclusion-weight changes.

Transitive Boost modules: 68 → 68 (0)

[github-actions]

Compiler-warning counts vs develop (auto-generated).
PR run 31246275246 vs develop run 31207793516 (46ad50e8b2).

Job	Baseline	After	Delta
macos (clang, 14)	681	604	-77
macos (clang, 17)	641	564	-77
macos (clang, 20)	641	564	-77
ubuntu (clang-19, 14)	681	604	-77
ubuntu (clang-19, 17)	641	564	-77
ubuntu (clang-19, 20)	641	564	-77
ubuntu (clang-19, 23)	641	564	-77
ubuntu (gcc-14, 14)	827	750	-77
ubuntu (gcc-14, 17)	949	872	-77
ubuntu (gcc-14, 20)	949	872	-77
ubuntu (gcc-14, 23)	949	872	-77
windows_msvc_14_3 (msvc-14.3)	971	971	0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (e8e3f01) to head (46ad50e).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@ Coverage Diff @@## develop #552 +/- ##
===========================================
- Coverage 92.45% 92.44% -0.02% 
===========================================
Files 392 392 Lines 28214 28214 Branches 8008 8008 ===========================================
- Hits 26086 26083 -3 - Misses 2024 2026 +2 - Partials 104 105 +1 

Files with missing lines	Coverage Δ
example/astar-cities.cpp	95.78% <100.00%> (ø)
example/bipartite_example.cpp	100.00% <100.00%> (ø)
example/canonical_ordering.cpp	94.11% <100.00%> (ø)
example/cycle_ratio_example.cpp	100.00% <100.00%> (ø)
example/grid_graph_example.cpp	96.87% <100.00%> (ø)
example/grid_graph_properties.cpp	100.00% <100.00%> (ø)
example/incremental-components-eg.cpp	100.00% <100.00%> (ø)
example/incremental_components.cpp	100.00% <100.00%> (ø)
example/kuratowski_subgraph.cpp	92.10% <100.00%> (ø)
example/make_biconnected_planar.cpp	92.85% <100.00%> (ø)
... and 17 more

... and 3 files with indirect coverage changes

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