/**
 * Pull the commit message out of a `git commit -m <msg>` command.
 *
 * Handles three input shapes the walker may emit:
 *
 *   1. Double-quoted: `git commit -m "feat: foo"` — the `-m` value is
 *      a single quoted token preserved by the shell. Captured between
 *      the double-quotes.
 *   2. Single-quoted: `git commit -m 'feat: foo'` — same shape with
 *      single quotes.
 *   3. Tokenized (AST-flattened): the walker may flatten
 *      `git commit -m "feat: foo bar"` to the raw command text
 *      `git commit -m feat: foo bar` (quotes stripped, multi-word
 *      message). Captured greedily after `-m` up to the next flag
 *      (a token starting with `-`) or end-of-string. This shape is
 *      what `ctx.input.command` typically holds for a multi-word
 *      message in pi-steering.
 *
 * Returns null if no `-m` is present (e.g., `git commit` alone, which
 * would open the editor; not a case the format predicate validates).
 *
 * @example
 * extractCommitMessage(`git commit -m "feat: x"`)        // "feat: x"
 * extractCommitMessage(`git commit -m 'feat: x'`)        // "feat: x"
 * extractCommitMessage(`git commit -m feat: x`)          // "feat: x"
 * extractCommitMessage(`git commit -m feat: x --amend`)  // "feat: x" (stops at --amend)
 * extractCommitMessage(`git commit`)                      // null
 */
export declare function extractCommitMessage(cmd: string): string | null;
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