fix: git issues list --repo silently accepts malformed repo filters and exact-matches untrimmed input - #1062

Summary

Fixes gitt issues list --repo so repository filters are normalized and validated before filtering issues.
Merged PR #910 added --repo <owner/name>, but the implementation compared raw user input directly against repository_full_name. That caused valid filters with surrounding whitespace to return no results, and malformed filters to be silently accepted.

Related Issue

Fixes: #1061

Real Behavior Proof

Before this change, gittensor/cli/issue_commands/view.py filtered with the raw CLI value:

if repo_filter and issue_id is None:
    issues = [
        i for i in issues
        if i.get('repository_full_name', '').lower() == repo_filter.lower()
    ]

So this valid input failed to match:

gitt issues list --repo " owner/repo "

And malformed inputs were accepted as filters:

gitt issues list --repo ownerrepo
gitt issues list --repo owner//repo
gitt issues list --repo https://github.com/owner/repo

Solution

issues_list now reuses the existing repository validator:

owner, repo_name = validate_repository(repo_filter, verify_exists=False)
repo_filter = f'{owner}/{repo_name}'

This makes --repo behavior consistent with other issue commands.

Updated Behavior

Whitespace-padded valid filters are normalized:

gitt issues list --repo " owner/repo "

now behaves like:

gitt issues list --repo owner/repo

Malformed filters now fail before contract reads with a bad parameter error.

Validation Notes

Added tests for:

• --repo " owner/repo " in JSON mode
• --repo " owner/repo " in human table mode
• invalid --repo ownerrepo
• invalid --repo owner//repo
• invalid URL-like repo input
• JSON bad_parameter response shape

Local checks run:

python3 -m py_compile gittensor/cli/issue_commands/view.py tests/cli/test_issues_list_json.py
git diff --check

Both passed.
Full pytest could not be run in this environment because pytest, uv, and pip are not installed.