Add pyupgrade to the pre-commit/CI path

[Copilot]

This wires pyupgrade into the existing pre-commit workflow instead of adding a separate periodic check. The repository now enforces syntax modernization on every PR/push via the current CI pre-commit step, while keeping a direct local invocation path for developers.

• Pre-commit integration

  • Adds pyupgrade to .pre-commit-config.yaml
  • Targets the repo baseline with --py314-plus

• Developer workflow

  • Documents that pyupgrade runs as part of the normal pre-commit suite
  • Documents an explicit on-demand command for local use

• Repository alignment

  • Includes the immediate auto-fix required by the new rule in BitVector/BitVector.py so the hook passes when enabled

- repo: https://github.com/asottile/pyupgrade
  rev: v3.21.2
  hooks:
    - id: pyupgrade
      args: [ --py314-plus ]

• Fixes pyupgrade checks #72

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[Copilot]

Copilot review overview

🟡 Changes recommended

Configure the hook for Python 3.14 to match the project’s supported language level.

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Review effort: Lite
Findings: 1

Open (1)

• Configure the hook for the project's Python 3.14 target · New

[Copilot]

Copilot review overview

🟢 Approval recommended

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Review effort: Lite
Findings: None

Resolved since last review (1)

• Configure the hook for the project's Python 3.14 target

[Copilot]

Copilot review overview

🟢 Approval recommended

Only minor documentation wording nits remain; no blocking issues were identified.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🔵 Needs a closer look

Restore postponed annotation evaluation or quote forward references to prevent import-time NameError.

Review effort: Lite
Findings: None