feat(cli): add man page generation via make manpage

[Kshitij-K-Singh]

What

Add make manpage target to generate man pages for all CLI commands using Cobra's built-in doc.GenManTree.

Why

Distribution of kerno as a system tool (deb/rpm/Homebrew) expects /usr/share/man/man1/kerno.1.gz to exist. Cobra's doc package auto-generates man pages from the command tree — always in sync, no hand-written troff.

Fixes #15

How

• Created cmd/kerno-mangen/main.go using cobra/doc.GenManTree
• Post-processes generated files to use hyphen-separated names (kerno-doctor.1 instead of kernodoctor.1)
• Added manpage: target to Makefile
• Added docs/man/*.1 to .gitignore (regeneratable artifacts)
• Updated README with make manpage in build targets
• No new runtime dependencies — github.com/spf13/cobra/doc is already part of the cobra module

Testing

• go build ./... passes
• go test ./... passes
• go vet ./... passes
• golangci-lint run ./... passes
• Tested locally with:

• N/A — pure docs/refactor
• sudo ./bin/bpf-verify --read 5s confirms 6/6 programs still load
• ./scripts/verify.sh passes (or specific phase: ./scripts/verify.sh quality)

Checklist

• PR title follows Conventional Commits (feat(scope): subject)
• All commits are DCO-signed (git commit -s)
• No unrelated changes pulled in
• Documentation updated where user-visible behavior changed
• Added/updated tests for new code paths
• If a new doctor rule, paired with a chaos scenario in scripts/verify.sh

[github-actions]

🚀 First PR — welcome aboard!

A few things to expect:

1. CI: every PR runs build + race tests + lint + (eventually) the kernel matrix. If something fails, the log will tell you exactly which gate.
2. DCO: every commit needs Signed-off-by: — git commit -s adds it automatically.
3. Conventional Commits: PR titles like feat(doctor): add new rule or fix(bpf): handle X. We squash-merge by default.
4. Review: a maintainer will review within 72 hours. Suggestions are conversations, not orders — push back if something doesn't fit your context.

If you get stuck, reply here or jump to Discussions. We want this PR to land.

[btwshivam]

add screenshort of manpage.. ill then review techinal part

[Kshitij-K-Singh]

Attached the screenshot @btwshivam