Method _completeRequirement

src/session/tdd_state.js:167–194

* Mark a requirement as complete (used internally after a cycle reaches green). * If loopActive, auto-starts the next pending requirement's cycle. * * @param {string} reqId * @returns {{ ok: boolean, advanced: boolean, next: object|null, message: string }}

(reqId)

   * @returns {{ ok: boolean, advanced: boolean, next: object|null, message: string }}
   */
  _completeRequirement(reqId) {
    const req = this._requirements.find(r => r.id === reqId);
    if (!req) return { ok: false, advanced: false, next: null, message: `Requirement ${reqId} not found.` };

    req.status = REQ_STATUS.DONE;
    this._save();

    const next = this._requirements.find(r => r.status === REQ_STATUS.PENDING);
    if (next) {
      next.status = REQ_STATUS.ACTIVE;
      this._save();
      return {
        ok: true,
        advanced: true,
        next,
        message: `✓ "${req.text}" done. Moving to next: "${next.text}" (${next.id}).`,
      };
    }

    const done = this.doneRequirements().length;
    const total = this._requirements.length;
    return {
      ok: true,
      advanced: false,
      next: null,
      message: `✓ All ${total} requirement(s) implemented. Run run_tests (full suite) to confirm no regressions, then the loop is complete.`,
    };
  }

  /**
   * Mark that a clean full-suite run was observed. Only meaningful after