refactor(ethexe): replace manual fmt::Display/Debug impls with derive_more

[grishasobol]

Summary

Replaces 8 hand-written fmt::Display/fmt::Debug impls across the ethexe workspace with their derive_more equivalents. Net -20 lines and the local format strings now live next to the type they format.

Migrations

Crate	Type	Trait	Notes
ethexe-blob-loader	BlobLoaderEvent	Debug	Delegates to inner via #[debug("{_0:?}")]
ethexe-node-loader	ValueProfile	Display	Lowercase variant names via per-variant #[display]
ethexe-cli	RawOrFormattedValue<C>	Display	Forwards to inner
ethexe-malachite-core	Address	Display	0x{hex}
ethexe-malachite-core	ValueId	Display + Debug	0x{hex} / ValueId(0x{hex})
ethexe-malachite	MalachiteEvent	Display	Per-variant #[display]
ethexe-common	HashOf<T>	Debug	HashOf<short>({hash:?})
ethexe-common	MaybeHashOf<T>	Debug	MaybeHashOf<short>({option_string})

Skipped (kept manual)

• CoordinatorBoot::Debug — uses debug_struct(..).finish_non_exhaustive().
• AlternateCollectionFmt::Debug — branches on f.alternate().
• FormattedValue::Display, LoadRunReport::Display — non-trivial logic (trim trailing zeros, build pretty multi-line summaries).

Notes

• The shortname<T>() helper in ethexe/common/src/hash.rs is now flagged by the dead_code lint because rustc does not trace function calls placed inside the format_args! invocations emitted by derive_more::Debug. cargo expand confirms the function is still called; the macro-generated code reads format_args!("HashOf<{0}>({1:?})", shortname::<T>(), hash). An #[allow(dead_code)] is added with a comment explaining this.
• Adds derive_more to the dependencies of crates that did not yet use it (blob-loader, cli, node-loader, malachite-core, malachite).

Test plan

• cargo check --workspace --all-targets is clean.
• cargo nextest run -p ethexe-common -p ethexe-blob-loader -p ethexe-node-loader -p ethexe-cli -p ethexe-malachite-core -p ethexe-malachite — 183 passed, 1 leaky (pre-existing test_formatted_value handle leak, test result reports 1 passed; 0 failed).
• Full CI run.

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