Add pre-commit hooks for clang-format, flake8, cmake-lint, shellcheck and copyright

[bburda]

Pull Request

Summary

Add pre-commit hooks for clang-format, flake8, cmake-lint, shellcheck and copyright

• Add .pre-commit-config.yaml with hooks matching ament_lint tooling
• Add .flake8 config matching ament_flake8 defaults (ROS 2 Jazzy)
• Add missing Apache 2.0 headers to docs/conf.py and generate_verification.py
• Fix shellcheck warnings in setup-env.sh
• Fix flake8 violations in generate_verification.py (E203, E501)
• Document pre-commit setup in README.md and CONTRIBUTING.md

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Issue

Link the related issue (required):

• closes Add pre-commit hook to run clang-format on changed files #148

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Type

• Bug fix
• New feature or tests
• Breaking change
• Documentation only

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Testing

How was this tested / how should reviewers verify it?
precommit run all fixes

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Checklist

• Breaking changes are clearly described (and announced in docs / changelog if needed)
• Tests were added or updated if needed
• Docs were updated if behavior or public API changed

[Copilot]

Pull request overview

Adds a repository-level pre-commit configuration to run common formatting/linting checks locally (aligned with the ROS 2 / ament lint workflow), and applies small cleanups/headers/docs updates needed for the new checks.

Changes:

• Add .pre-commit-config.yaml and .flake8 to enable local lint/format hooks (clang-format, flake8, cmake-lint, shellcheck, copyright).
• Add missing Apache 2.0 headers to Python files and fix a few flake8/shellcheck issues.
• Document pre-commit setup in README.md and CONTRIBUTING.md.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
scripts/generate_verification.py	Adds license header + flake8-driven formatting tweaks.
docs/conf.py	Adds license header to Sphinx config.
README.md	Documents pre-commit installation and usage.
CONTRIBUTING.md	Adds pre-commit installation step to contributor workflow.
.pre-commit-config.yaml	Defines pre-commit hooks for formatting/linting/copyright.
.flake8	Adds flake8 configuration intended to match ament defaults.
.devcontainer/setup-env.sh	Addresses shellcheck warnings and minor formatting.