refactor(type): drop redundant lombok accessor attributes

[eastspire]

Summary

Clean up violations of two rust-standards lombok accessor rules:

• §17.14.1 (check 23) — drop a redundant explicit pub. The Default of
  lombok_macros::Visibility is already Public
  (lombok-macros/src/visibility/enum.rs), so omitting the visibility
  generates a pub accessor and spelling out pub is pure noise.
• §17.14.2 (check 24) — drop bare #[get] / #[get_mut] / #[set].
  #[derive(Data)] is Getter + GetterMut + Setter in one, so the field
  already has its accessor and an argument-less attribute just restates the
  default.

Why both rules must land in one PR

They are two levels of the same construct, not two independent rules:

#[get(pub)]   // violates check 23
#[get]        // what check 23's table called "the fix" — violates check 24
              // the only legal end state: the whole line is gone

Applying check 23 alone turns 12 #[get(pub)] into 12 bare #[get], which
creates exactly the violations check 24 forbids. So this PR walks straight to
the end state: delete the line where the attribute is redundant, keep it only
where it carries information.

This is also why rust-standards/references/17-lombok-derives.md §17.14.1 was
corrected in the same series — its table listed #[get] as check 23's answer,
which was wrong.

Changes

Three commits:

Commit	Content
ef3f8ba	Drop redundant explicit pub
cffb620	chore: bump version to 21.9.0
361a2a8	Drop bare accessor attributes — 23 across 3 files

Files touched:

• core/src/route/struct.rs — 4
• type/src/request/struct.rs — 7
• type/src/task/struct.rs — 12

Verification

• cargo check --workspace --all-targets passes
• cargo clippy --workspace --all-targets — 0 warnings
• verify_no_redundant_accessor_attr.py → 378 files checked, 0 violations
• audit check 23 and check 24 both PASS
• No bare attribute and no #[…(pub)] remains anywhere in the tree

Notes

Deliberately left alone:

• #[get(pub(crate))] / #[set(pub(crate))] / #[get_mut(pub(crate))] —
  visibility narrowing required by §17.14
• #[get(type(copy))], #[set(Into)], #[get(skip)] and friends — they carry
  information the derive cannot infer
• #[new(...)] / #[with(...)] — New and With are independent derives
  that Data does not imply, so their attributes are always meaningful

The repository still has pre-existing violations in unrelated checks (§5.1
explicit type annotations, §2.1 doc comments, §1.3c hardcoded strings,
§13.7 features order) that predate this PR. This PR does not claim a clean
whole-repo audit.