feat(tooling): pre-commit + commitizen + golangci-lint (issue-based branches)

[sugan0tech]

Implements pre-commit with branch/commit rules, Go fmt/vet, and golangci-lint.

• Enforces branch pattern: <type>/<issue>-<short-desc> with minimal types: feat, feature, fix, add, chore, docs, refac, wip, hotfix, security.
• Adds Commitizen (Conventional Commits subset) on commit-msg with custom schema.
• Adds go fmt/vet hooks and golangci-lint; detect-secrets and hygiene hooks.

Docs

• Adds CONTRIBUTING.md with local setup, branch/commit rules, workflow, and links to good first issues.
• README links to the contributor guide.

Closes #29
Supersedes #$OLD_PR

[sugan0tech]

@apachex692 your review please.

[ssanumand]

Detailed documentation done and is appreciated. I've tested the same in my local environment and it seems to work fine. I'm approving. Thank you for the work.

[sugan0tech]

Daymm, you tested in local.Much appreciated testing!!