fix(with-watch): address merged PR review feedback

[kdy1]

Summary

• address the remaining merged-PR review follow-ups across the with-watch parser, planner, and runner
• stop logging raw delegated argv and shell expressions while keeping structured spawn metadata for debugging
• tighten watch-input validation and inference for blank explicit inputs, shell option tokens, grouped grep -f flags, and find -D/-O options
• preserve self-mutation suppression while rerunning once when an external change lands during a self-mutating command run

Testing

• cargo test -p with-watch
• cargo test

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: e8b1a83ac5

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Avoid rerun when only self-mutations occurred

In run, self-mutating commands now rerun whenever pending_rerun is set, even if all observed in-run changes were produced by the delegated command itself. Because pending_rerun is set after the second meaningful snapshot delta, commands that legitimately mutate watched inputs multiple times in one execution (for example, a shell command chaining two sed -i edits) will enqueue another run without any external file edit, creating unnecessary reruns and possible loops.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Preserve option-value pairing for shell analysis

Splitting Argument::Option(option, Some(value)) into two argv tokens causes downstream analyzers to reinterpret option values as positional arguments when they don't explicitly model that option. A concrete regression is --shell "grep --color=auto foo": --color=auto becomes --color auto, auto is treated as the consumed pattern, and foo is incorrectly inferred as a watch input instead of returning NoWatchInputs, so shell mode can silently watch bogus paths.

Useful? React with 👍 / 👎.