fix(gh): passthrough --help/-h on pr subcommands (#1474)

[season179]

Closes #1474.

rtk gh pr comment --help returns ok commented, pr edit --help returns ok edited, and pr create --help stitches ok created onto mangled help text. pr view/checks/diff --help are also broken — they error with PR number required or drop output silently. Six of nine gh pr subcommands corrupt their help output.

Cause: pr_action and pr_create fabricate confirmations from ok_confirmation() regardless of stdout; view_pr/pr_checks require a positional PR number; pr_diff runs compact_diff over non-diff text. None of them check for --help/-h.

Fix: add a has_help_flag helper next to the existing has_json_flag, and short-circuit run_pr to passthrough when the flag is present. Same family as #720 / #730 — flag-aware passthrough at the dispatcher.

Verified locally on macOS / rtk 0.38.0:

subcommand	before	after
comment / edit	ok commented / ok edited	real help
create	ok created + mangled help	real help
view / checks	PR number required	real help
diff	empty stdout	real help
status / merge / list	✓ already worked	✓ unchanged

-h short flag also works. Filter path for non-help calls is unaffected (rtk gh pr list -L 3 still shows the compact format).

Test plan

• 5 unit tests on has_help_flag (long, short, absent, substring resistance, --body=--help value form)
• cargo fmt --all && cargo clippy --all-targets -- -D unsafe_code && cargo test --all — 1691 + 5 new pass
• Live binary check across all 9 gh pr subcommands
• Regression sanity: filtered rtk gh pr list output unchanged

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[pszymkowiak]

[w] wshm · Automated triage by AI

📊 Automated PR Analysis

🐛 Type	bug-fix
🟢 Risk	low

Summary

Fixes six of nine gh pr subcommands whose --help/-h output was corrupted by rtk filters fabricating confirmations or requiring positional args. Adds a has_help_flag helper and short-circuits run_pr to passthrough when the flag is present, letting gh print its native help text.

Review Checklist

• Tests present
• Breaking change
• Docs updated

Linked issues: #1474

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Analyzed automatically by wshm · This is an automated analysis, not a human review.

[dergachoff]

bumping this pr since issue is very annoying